Would Like Some Of You Gentlemen's Thoughts On A Brake Issue

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
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 some pressure as the lines exit the master cylinder, (further testing to follow)
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


potentially related info

https://itstillruns.com/bleed-gm-abs-brakes-5022330.html

https://corvettesalvage.com/1986-to-1991-corvette-abs-brake-pump-fix/

https://www.zip-corvette.com/95-lt1-96-brake-line-set-stainless-steel-7-piece.html

https://www.carid.com/1996-chevy-co...s/?filter=1&sub-model[ourSubModelName][]=Base

https://www.zip-corvette.com/84-96-c4/brakes.html


http://garage.grumpysperformance.com/index.php?threads/upgrading-your-c4-to-c5-brakes.13/

https://www.lwta.net/photos/Corvette C4 ABS-ASR Operation and Diagnosis Manual.pdf

http://garage.grumpysperformance.com/index.php?threads/cant-bleed-brakes.15969/
 
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Hmmm.

Don't know for sure but, A few years ago I was working on a 2003 chevy truck. I had the same issue with the brakes not wanting to bleed.

What I found was that the truck had hydro boost.... when I started the engine, I could bleed the brakes. I think it had something to do with the
proportioning valve being tied into the booster..
 
yeah, I already considered that possibility, and tested it, without finding the running or non-running engine had any effect on results
 
Try loosening the metal line in front of the rubber line and see if you have pressure. Rubber hoses will collapse on the inside. Or try right after the anti-lock controller.

As you say--test and retest--and I know it is hard to get to some of those places on a 'vette.
 
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