YotaTech Forums  

Go Back   YotaTech Forums > Toyota SUV & Truck Tech > 95.5-2004 Tacomas & 96-2002 4Runners
Sign in using an external account
Register Forgot Password?
Search


95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 01-29-2009, 08:38 AM   #1
Registered User
Personal Sales Rating: (0)
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
Help!!! Breaks caliper won't release!

1998 4Runner SR5
4x4
ABS

To give everybody some background on the situation, at the beginning of the year I was driving down an icy, sloped street and applied my breaks to slow down. Everything seemed fine until the right side of the vehicle traveled over a dry section of pavement. It was at that moment I discovered the right front tire was not rotating, even after I released the break pedal. The tire ended up skidding across the pavement, causing the vehicle to pivot around. After talking it over with a few people, I reached the conclusion that perhaps one of the caliper pistons had seized. I proceeded to replace the front breaks, calipers and all, upgrading to the Tundra setup. This apparently did not solve the problem, and a couple of days later, driving down a similar street, the problem arose again.

Thinking that perhaps it had something to do with the ABS, I removed the fuse and drove around. Still the break locks up and stays locked after I release the pedal. I tried to get the break to lock up on a flat surface, but was not successful. This leads me to believe the problem is related to angle of the vehicle and the level sensing proportioning valve.

Does anybody have a schematic for the break system? I want to know where in the system the level sensing proportioning valve is.

I need help determining the culprit of this problem. Manditory time off with out pay, due to the economy, means I can not go to my mechanic for help. Has anybody experienced anything like this? Any help would be great!!!
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
flyfishexpert is offline   Reply With Quote
Old 01-29-2009, 09:09 AM   #2
Registered User
Personal Sales Rating: (0)
 
Tylercs's Avatar
 
Join Date: Nov 2006
Location: Chehalis/Ellensburg, WA
Posts: 46
This happend on my wifes focus and it was the caliper. But I guy at the parts store said that it could be the rubber brake line he said when the brake fluid gets hot from a long prolonged stop or slowing like going down a hill it can cause the line to balloon restricting the movement of the fluid back after the peddle is released and cause the brake to stay engaged. Then the problem might not show up when everything has cooled down.

I hope that helps but it could be all bogus because he wanted to replace all the lines and was ticked off when I said all change the calipers myself.
__________________
1984 Short bed. About as stock as you can get.

1967 Rambler Rebel
Tylercs is offline   Reply With Quote
Old 01-29-2009, 09:45 AM   #3
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
Quote:
Originally Posted by Tylercs View Post
This happend on my wifes focus and it was the caliper. But I guy at the parts store said that it could be the rubber brake line he said when the brake fluid gets hot from a long prolonged stop or slowing like going down a hill it can cause the line to balloon restricting the movement of the fluid back after the peddle is released and cause the brake to stay engaged. Then the problem might not show up when everything has cooled down.

I hope that helps but it could be all bogus because he wanted to replace all the lines and was ticked off when I said all change the calipers myself.
Calipers have been replaced.
Problem occurs at any time, after little breaking and lots of breaking. Seems like mostly happens when traveling down a decline with ice. (Actually noticed it happen on decline with gravel covered pavement too)
flyfishexpert is offline   Reply With Quote
Old 01-29-2009, 04:31 PM   #4
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
Bump for a little help!
flyfishexpert is offline   Reply With Quote
Old 01-29-2009, 04:46 PM   #5
Registered User
Personal Sales Rating: (0)
 
Yukon's Avatar
 
Join Date: Apr 2008
Location: Marquette, MI
Posts: 484
you bleed the whole system? maybe a master cylinder
Yukon is offline   Reply With Quote
Old 01-29-2009, 07:07 PM   #6
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
I have only bled the front, but I don't see how air in the line would cause the caliper to lock. Air in the lines would cause the system to spongy, right?

I have thought about the master cylinder, but I think it only happens when going down a slope causes me to think it is the LSPV.
flyfishexpert is offline   Reply With Quote
Old 01-30-2009, 06:25 AM   #7
Registered User
Personal Sales Rating: (0)
 
Join Date: Jun 2007
Location: Centennial, CO
Posts: 13
I believe abs equipped 4runners do not have the proportioning valve. At lease my 97 doesn't.... I just completed the tundra brakes on both my vehicles, and have an extra master cylinder if you want it. I have both styles. Which calipers did you install? The 13WL requires a little grinding to clear the stock wheels...

Last edited by scotch; 01-30-2009 at 06:29 AM.
scotch is offline   Reply With Quote
Old 02-01-2009, 12:27 PM   #8
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
Quote:
Originally Posted by scotch View Post
I believe abs equipped 4runners do not have the proportioning valve. At lease my 97 doesn't.... I just completed the tundra brakes on both my vehicles, and have an extra master cylinder if you want it. I have both styles. Which calipers did you install? The 13WL requires a little grinding to clear the stock wheels...
I traced all of the break lines and did discover there is no proportioning valve.

I ended up installing the 13WE calipers so I would not have to grind the wheels.

I am going to replace the flexible line on that side to see if it is damaged and causing the problem. We will see what happens.
flyfishexpert is offline   Reply With Quote
Old 02-06-2009, 12:41 PM   #9
Contributing Member
Personal Sales Rating: (0)
 
northfacer581's Avatar
 
Join Date: Aug 2004
Location: charlotte
Posts: 1,006
dude im having the EXACT same problem. however mine is happening more than just declines, it really happens quite a bit more, especially when im coming from 5mph to a stop if i do it somewhat fast instead of very slowly. i thought it was simply because i havent had my pads or rotors checked in a while, and they (dealership) replaced both up front, but it still happens.

please let me know what you find out. best of luck with it.
__________________
-Andy
99 4runner. 5spd. Supercharged. SOLD and missed
2006 4runner Sport Edition 4x4 V6. work in progress
northfacer581 is offline   Reply With Quote
Old 02-06-2009, 01:07 PM   #10
Registered User
Personal Sales Rating: (0)
 
darksoldier313's Avatar
 
Join Date: Jan 2009
Location: quincy illinoise
Posts: 153
first thing that comes to mind is a clogged line somewhere from the master to the caliper usually its the brake hose directly on the caliper however metal brakelines do rust and build up inside my suggestion would be to break open the bleeder on the side that locks if fluid drips freely thats not your problem if it doesnt id check the lines replace and flush the system
darksoldier313 is offline   Reply With Quote
Old 02-06-2009, 02:23 PM   #11
Registered User
Personal Sales Rating: (0)
 
holskey's Avatar
 
Join Date: Dec 2008
Location: cary north carolina
Posts: 13
collapsed brake lines

if im right it could be the brake line..... i had the same problem on a camaro. what happens is the rubber inside the line swells and it cant release the piston... the fluid can still go into the caliper but b/c the swelling it cant get back out. try replacing your lines.
holskey is offline   Reply With Quote
Old 02-06-2009, 02:26 PM   #12
Registered User
Personal Sales Rating: (0)
 
holskey's Avatar
 
Join Date: Dec 2008
Location: cary north carolina
Posts: 13
Quote:
Originally Posted by darksoldier313 View Post
first thing that comes to mind is a clogged line somewhere from the master to the caliper usually its the brake hose directly on the caliper however metal brakelines do rust and build up inside my suggestion would be to break open the bleeder on the side that locks if fluid drips freely thats not your problem if it doesnt id check the lines replace and flush the system
sorry should have said..... check for fluid drip like (darksoldier) said.
holskey is offline   Reply With Quote
Old 02-09-2009, 10:35 AM   #13
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
I have narrowed down the proble to the ABS actuator. There is no abstruction in the line because I can bleed the system fine and fluid drips out when the lines are disconnected. The only other component in the system that it could be is the ABS actuator. The actuator has a series of valves that relieve the pressure in an indevidual line and then reaplies the preasure with a small pump. I am thinking the valves for that wheel are bad. I will be calling around to get the price on a used actuator from an auto salvage lot.

Andy,
Is your problem on the same side as mine? Right Front?
flyfishexpert is offline   Reply With Quote
Old 03-02-2009, 05:37 AM   #14
Registered User
Personal Sales Rating: (0)
 
knucklehead38401's Avatar
 
Join Date: Feb 2006
Location: Mt. Pleasant, Tennessee
Posts: 179
Any updates on this? I'm having the same problem on a 97. I replaced both calipers, rubber lines, rotors and pads. I haven't tried a master cylinder yet, that is the next thing and I'm going to reverse bleed the system and change fluid.

Last edited by knucklehead38401; 03-02-2009 at 05:38 AM.
knucklehead38401 is offline   Reply With Quote
Old 03-02-2009, 08:14 AM   #15
Registered User
Personal Sales Rating: (0)
Threadstarter [OP]
 
flyfishexpert's Avatar
 
Join Date: Aug 2006
Location: The Big Wonderful
Posts: 374
livingoverland livingoverland
I have since replaced the ABS actuator with a used one from a salvage yard, but the problem still persists.

Because the problem only happens on the right front side, it leads me to believe the problem is not with the master cylinder. My next step will be removing the hard lines from the ABS actuator to the rubber lines on that side. About half the way down, there is a small block where the line from the actuator meets the line connected to the rubber line. I now have a feeling the problem lies there. We will see.
flyfishexpert is offline   Reply With Quote
Old 07-26-2009, 06:29 AM   #16
Registered User
Personal Sales Rating: (0)
 
Crux's Avatar
 
Join Date: Dec 2004
Location: Castle Rock, CO
Posts: 842
Did you ever figure out where the problem was?
__________________

97 4Runner SR5 Blue - 135k miles, E-Locker, Armorology front/rear bumpers & sliders, BudBuilt skidplate+belly, MTR 285/75/16s, 2" Tundra/OME Lift, 1" 4Crawler Bodylift, 1" diff drop, Black Aluminum Wheels, Cobra CB
04 Land Cruiser Grey - 90k miles, OME Lift, Slee Sliders, 35" Toyo Muds
Crux is offline   Reply With Quote
Old 07-26-2009, 06:27 PM   #17
Registered User
Personal Sales Rating: (0)
 
knucklehead38401's Avatar
 
Join Date: Feb 2006
Location: Mt. Pleasant, Tennessee
Posts: 179
I got another new master cylinder and it fixed the problem, I guess I must have got a bad one the first time.
knucklehead38401 is offline   Reply With Quote
Old 07-26-2009, 06:27 PM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
4runner, back, bleed, brake, breaking, caliper, calipers, open, piston, release, seized, stays, toyota, valve, wont

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Spongy Brakes Bassinfool 95.5-2004 Tacomas & 96-2002 4Runners 16 02-17-2010 06:43 AM
Clunky Breaks phatride4ever 95.5-2004 Tacomas & 96-2002 4Runners 7 05-19-2006 09:51 PM
breaks benthere25 95.5-2004 Tacomas & 96-2002 4Runners 15 09-16-2005 05:16 PM
Oh how my Runner breaks... mxracer0486 95.5-2004 Tacomas & 96-2002 4Runners 2 06-28-2004 07:49 AM
Breaks Brad 95.5-2004 Tacomas & 96-2002 4Runners 2 10-09-2002 06:48 PM


All times are GMT -8. The time now is 11:41 PM.


2010 InternetBrands, Inc.