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Username Post: I would like some of you gentlemen's thoughts on a brake issue,        (Topic#364512)
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17622
grumpyvette
Age: 73
Loc: FLORIDA USA
Reg: 03-16-01
03-03-21 11:36 AM - Post#2815492    

I would like some of you gentlemen's thoughts on a brake issue,
Ive learned long ago that if you start out asking questions before diving head first off the proverbial dock,
into what might not be a simple problem or repair,
and that you generally benefit from listening to and questioning other people,
(theres ALWAYS some guy who knows more than you do on any one subject,
or at least has had much more extensive experience,
and knows a bit because he screwed up or paid a great deal of cash solving some issue)
as they may have spent a good deal of time and money solving an issue and gaining experience you might not have thought of dealing with previously.

I went to bleed the brakes on my 1996 corvette last evening, and the front brakes worked out ok, not so with the rear brakes, so my first though was the master cylinder might be defective as the corvette has sat un-used for a couple months, I loosened the lines on the master cylinder as a test and had one of my grand kids stomp on the brakes,
and the master cylinder produces flow and pressure as the lines exit the master cylinder,
and while the brake fluid was not all that pristine in appearance it works ok on the front brakes so I replaced all the fluid and bled those front brakes,
I don't think its a blocked hydraulic line or defective caliper, in the rear, simply because BOTH rear brakes are acting suspiciously like the pressurized fluid is not reaching the calipers, so the next more likely source of the problem is the anti-lock brakes controller, located behind the rear drivers seat.
so thoughts and any tips or testing ideas are rather welcome?
before I start looking into this.
yes Im well aware of the proper order and its been followed, I appreciate that must be done correctly.
Im just curious why both rear brakes suddenly won,t bleed?
once I find out Ill post  what I find / learn

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 03-03-21 12:33 PM. Reason for edit: No reason given.

 


TAT_2 
Site Ambassador - Member #26 - "20th Year" Silver Supporting Member
Posts: 37018
TAT_2
Age: 67
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
03-03-21 02:58 PM - Post#2815502    
    In response to grumpyvette

AINT THERE SOME KIND OF "PARKING BRAKE AUTO ADJUST"?
I STOPED USEING EMG / PARKING BRAKES AGES AGO.


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Mel Foye 
*VIP* Original Founding Member Group
Posts: 5057
Mel Foye
Reg: 09-29-00
03-04-21 05:59 PM - Post#2815582    
    In response to grumpyvette

Been too long but I recall a floating pin--don't lose both F and B if one leaks. Also on the ABS unit behind the drivers seat unit there was something that had to be held in??




 
Texasray 
"4th Year" Gold Supporting Member
Posts: 137
Texasray
Loc: Texas
Reg: 11-01-16
03-22-21 04:27 PM - Post#2816626    
    In response to Mel Foye

Hey Grumpy I haven't been on in a while so I hope you figured this out. I would try to actuate the rear brake valve circuit in the ABS hydraulic unit, we used to do this with a Tech 1 or 2, the GM scan tool. I am not sure any aftermarket is currently got the software to command GM control units. Anyway getting back to it, the only time I ran into this was on a '95-'96 corvette. Turned out some trash got into the valve and locked it in the closed mode. The module did not set a code as this to was done during a bleed procedure. So we never drove it, but I would imagine it would have set one if we had drivin' it.
Again I hope you already found this problem.

Sam



 


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