HELP! Brake peddle sinking to floor...
10-19-2003, 11:28 PM
#1
Registered User
Thread Starter
Join Date: Nov 2002
Location: Redondo Beach, CA
Posts: 441
Likes: 0
Received 0 Likes
on
0 Posts
HELP! Brake peddle sinking to floor...
Ok so now my brake paddle is sinking. Whenever it does it though, it comes back up after about half a second. The brakes are brand new and the lines have been bled. My dad suggested either master cylinder or brake booster. Anyone have any experiance w/ this? Thanks.
10-20-2003, 10:27 AM
#2
Contributing Member
Join Date: Feb 2003
Location: Seattle, WA
Posts: 2,858
Likes: 0
Received 0 Likes
on
0 Posts
What I would do:
1) Check brake fluid level in reservoir under hood.
2) Pull off front rims, look for any obvious leaks near calipers
3) Pull off rear rims and brake drums, look for leaks again
How recently did you get the brake work done? Its easy to not completely bleed the system, so if its just a mushy pedal (ie, fluid level is fine, no obvious leaks anywhere), I would think you've still got air in your lines.
1) Check brake fluid level in reservoir under hood.
2) Pull off front rims, look for any obvious leaks near calipers
3) Pull off rear rims and brake drums, look for leaks again
How recently did you get the brake work done? Its easy to not completely bleed the system, so if its just a mushy pedal (ie, fluid level is fine, no obvious leaks anywhere), I would think you've still got air in your lines.
10-20-2003, 10:33 AM
#4
Contributing Member
Join Date: Dec 2002
Location: The Lone Star State
Posts: 2,424
Likes: 0
Received 0 Likes
on
0 Posts
If it goes down and then comes back up the brake booster or the master cylinder would also be my first guess. Any leaks or air in the lines would not cause that to happen.
10-20-2003, 10:54 PM
#5
Registered User
Thread Starter
Join Date: Nov 2002
Location: Redondo Beach, CA
Posts: 441
Likes: 0
Received 0 Likes
on
0 Posts
What I would do:
1) Check brake fluid level in reservoir under hood.
2) Pull off front rims, look for any obvious leaks near calipers
3) Pull off rear rims and brake drums, look for leaks again
How recently did you get the brake work done? Its easy to not completely bleed the system, so if its just a mushy pedal (ie, fluid level is fine, no obvious leaks anywhere), I would think you've still got air in your lines.
1) Check brake fluid level in reservoir under hood.
2) Pull off front rims, look for any obvious leaks near calipers
3) Pull off rear rims and brake drums, look for leaks again
How recently did you get the brake work done? Its easy to not completely bleed the system, so if its just a mushy pedal (ie, fluid level is fine, no obvious leaks anywhere), I would think you've still got air in your lines.
If it goes down and then comes back up the brake booster or the master cylinder would also be my first guess. Any leaks or air in the lines would not cause that to happen.
Thanks.
10-21-2003, 05:03 AM
#6
Contributing Member
Join Date: Feb 2003
Location: Knoxville, TN
Posts: 291
Likes: 0
Received 0 Likes
on
0 Posts
ugh, brake booster all bad!! get ready for alot of this 
followed by some of this :cry: along with a whole lot of this 
so you may want to do alot of this 
ahead of time. i replaced a brake booster on an accord one time and it was by far the biggest PITA i have ever undertaken on a vehicle. i got a rebuild from a parts store that didn't work. i was told by several people that brake boosters are one of those parts that you have to get from the dealer more often than not. the rebuids just don't cooperate 
granted truck-type vehicles may be completely different
i'm with SLC Punk, i'd bleed the brakes again first before you start taking things apart - its simple and doesn't require a whole lot of time
followed by some of this :cry: along with a whole lot of this so you may want to do alot of this ahead of time. i replaced a brake booster on an accord one time and it was by far the biggest PITA i have ever undertaken on a vehicle. i got a rebuild from a parts store that didn't work. i was told by several people that brake boosters are one of those parts that you have to get from the dealer more often than not. the rebuids just don't cooperate granted truck-type vehicles may be completely differenti'm with SLC Punk, i'd bleed the brakes again first before you start taking things apart - its simple and doesn't require a whole lot of time
10-21-2003, 07:22 AM
#7
Registered User
Join Date: May 2002
Location: Granite Falls, WA
Posts: 710
Likes: 0
Received 0 Likes
on
0 Posts
You can do a quick test on the booster by using a vacuum hand pump. Apply vacuum, if press holds then it's fine. Make sure to check the vac hoses going to the booster too.
Trending Topics
10-21-2003, 11:04 AM
#8
Contributing Member
Join Date: Jan 2003
Posts: 10,916
Likes: 0
Received 0 Likes
on
0 Posts
If you pump the brakes with the engine on, then hold steady pressure and the peddle sinks to the floor, it is the master cyl.
I agree with the other guys, do the cheap stuff first (re-bleed).
I agree with the other guys, do the cheap stuff first (re-bleed).
Thread
Thread Starter
Forum
Replies
Last Post
CanRunner
95.5-2004 Tacomas & 96-2002 4Runners
6
07-20-2015 01:29 PM
