'88 brake problem
Thread Starter
Instructor
Joined: Sep 2013
Posts: 198
Likes: 2
'88 brake problem
I rebuilt front calipers and replaced both rear calipers. I bled all of them
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
Melting Slicks
Joined: Mar 2016
Posts: 2,778
Likes: 580
From: Langley BC
I rebuilt front calipers and replaced both rear calipers. I bled all of them
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
If you then turn the car back off does the pedal stay 'soft' or return to a solid feeling?
Just trying to get a clear picture of exactly what is happening.
Last edited by DMITTZ; Mar 16, 2016 at 03:29 PM.
Le Mans Master
Joined: Jul 2004
Posts: 6,228
Likes: 698
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
I rebuilt front calipers and replaced both rear calipers. I bled all of them
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
at least 6 times. Have nice clear fluid at all wheels, and no bubbles.
I have a nice hard pedal... until i start the car. The pedal goes down
but doesn't seem to bottom out. Its a soft pedal. I didn't let the MC
go empty. Kept the level up at all times. The booster works. Firm
pedal then start up it goes down.
Does anybody have any thoughts as to what i'm doing wrong or forgot
to do?
Thread Starter
Instructor
Joined: Sep 2013
Posts: 198
Likes: 2
So, the brake pedal feels solid until the car I turned on, then it just goes to the floor when you push on it and does not come all the way back up and feels soft?
If you then turn the car back off does the pedal stay 'soft' or return to a solid feeling?
Just trying to get a clear picture of exactly what is happening.
If you then turn the car back off does the pedal stay 'soft' or return to a solid feeling?
Just trying to get a clear picture of exactly what is happening.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 198
Likes: 2
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Thread Starter
Instructor
Joined: Sep 2013
Posts: 198
Likes: 2
I did the one man process and then used a vacuum pump.
Does the car have to be running to bleed them? I never had so much
trouble bleeding brakes as on this '88. My '85 was very easy.
Maybe it has something to do wit the ABS?
Drifting
Joined: Feb 2016
Posts: 1,384
Likes: 339
From: Simi Valley CA
That sounds to me like a bad or going bad master. Once it has the power assist it can't handle the pressure. Bleeding a master is usually only necessary if you only change the master and don't want the hassle of bleeding the entire system. Once you've thoroughly bled the system the master is fine.
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
I did my 94's the traditional RR, LR With break pedal assistant & with a pump bleeder. Both perfect pedals. Manually. at Idle. Pump up the pedal. hold to the floor. open Bleeder tighten. all the way around. and not allowing the Master to empty!!!
Last edited by THE 383 admiral; Mar 16, 2016 at 04:24 PM.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 198
Likes: 2
So, the brake pedal feels solid until the car I turned on, then it just goes to the floor when you push on it and does not come all the way back up and feels soft?
If you then turn the car back off does the pedal stay 'soft' or return to a solid feeling?
Just trying to get a clear picture of exactly what is happening.
If you then turn the car back off does the pedal stay 'soft' or return to a solid feeling?
Just trying to get a clear picture of exactly what is happening.
Thanks