'98 4runner - no fluid to rear leaving ABS pump after changing brake fluid
05-09-2016, 06:13 PM
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'98 4runner - no fluid to rear leaving ABS pump after changing brake fluid
I have a 1998 4runner limited I recently purchased. Brake fluid was disgusting so I decided to flush/bleed the brakes.
Using the two person method, I started bleeding the brakes, starting with the right rear. Successfully flushed out a couple ounces of fluid from the right rear, then all of a sudden couldn't get any more fluid to either rear brakes. The front brakes are bleeding fine.
I traced the brake lines and found that I can successfully disconnect both lines from the master cylinder and push fluid through them - however leaving the ABS pump, there is only fluid for the two front brakes, not the rear line (one line feeds both brakes).
With the rear brake line disconnected from the ABS pump and the car off, the pedal doesn't travel more than an inch or two, so the fluid is unable to get through the ABS pump.
This leads me to believe that somehow bleeding the brakes screwed up the ABS unit? Is it possible some nasty old fluid clogged up the ABS pump? I would assume this wasn't possible as the hydraulic pressure from the brake lines should be enough to unclog any buildup.
I also tried pulling the ABS fuse, it had no effect. Fluid goes into the ABS pump from both master cylinder lines, but doesn't leave the ABS pump towards the rear. Everything was initially fine when I started bleeding brakes.
Any ideas?
thanks
Using the two person method, I started bleeding the brakes, starting with the right rear. Successfully flushed out a couple ounces of fluid from the right rear, then all of a sudden couldn't get any more fluid to either rear brakes. The front brakes are bleeding fine.
I traced the brake lines and found that I can successfully disconnect both lines from the master cylinder and push fluid through them - however leaving the ABS pump, there is only fluid for the two front brakes, not the rear line (one line feeds both brakes).
With the rear brake line disconnected from the ABS pump and the car off, the pedal doesn't travel more than an inch or two, so the fluid is unable to get through the ABS pump.
This leads me to believe that somehow bleeding the brakes screwed up the ABS unit? Is it possible some nasty old fluid clogged up the ABS pump? I would assume this wasn't possible as the hydraulic pressure from the brake lines should be enough to unclog any buildup.
I also tried pulling the ABS fuse, it had no effect. Fluid goes into the ABS pump from both master cylinder lines, but doesn't leave the ABS pump towards the rear. Everything was initially fine when I started bleeding brakes.
Any ideas?
thanks
Last edited by chicago60647; 05-09-2016 at 08:44 PM.
05-10-2016, 11:49 PM
#2
Does this have a pump or a valve??
If it has a pump what drives it??
Every vehicle I have the ABS Brake system has been removed for the very expensive valve not working.
Did the rear brakes ever work ??
I read something about problems bleeding ABS brakes but since I have none I don`t remember.
Do a search with the search engine of choice lots of info out there .
If it has a pump what drives it??
Every vehicle I have the ABS Brake system has been removed for the very expensive valve not working.
Did the rear brakes ever work ??
I read something about problems bleeding ABS brakes but since I have none I don`t remember.
Do a search with the search engine of choice lots of info out there .
02-11-2019, 12:28 AM
#3
Registered User
While you have the shifter out to fill the trans fluid... it's a great time to replace the plastic cup on the bottom of the shifter... takes the slop out of it...
02-11-2019, 05:41 AM
#4
Registered User
When purging nasty brake fluid; always suck all the old fluid out of the reservoir first
and mop it clean with lint-free rag and a little alcohol so that only new clean fluid is put thru the system..
and mop it clean with lint-free rag and a little alcohol so that only new clean fluid is put thru the system..
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