88 Brake issue - Page 2

BernieB · 10-31-2009, 07:26 PM

Quote:

Originally Posted by ltracer91r

ok, so I just re-bled the brakes and I got the light to go out.

Now the tricky question:
When I do slow steady stops the pedal constantly needs to be pushed farther and farther down.
But when I do Harsh, fast stops it doesn't.
I tried putting in neutral and revving at higher RPM's when slowing to see if it would change it at all(power booster) but it did the same thing.

Any Ideas?

Unless you're leaking brake fluid from somewhere, like a bad wheel cylinder, that's a defective master. It's letting fluid past the piston.

leolkfrm · 11-01-2009, 07:04 AM

ok so you proved air in the lines, did you bleed them so fresh fluid is at each wheel?

gmctrucks · 11-01-2009, 11:17 AM

I would bleed the whole system again.

ltracer91r · 11-01-2009, 03:21 PM

the whole system has been bled numerous times, with fresh fluid and no air at every wheel.
I'm thinking I might rebuild the front calipers, or replace.

leolkfrm · 11-01-2009, 03:25 PM

are the back brakes adjusted correctly?

BernieB · 11-01-2009, 07:32 PM

Defective master... Slow pedal drop with steady pressure, and no leaks anywhere. Nothing else it could be.

leolkfrm · 11-02-2009, 04:47 AM

front caliper hoses may be starting to collapse, causing slow fluid flow

88fivespd · 11-02-2009, 10:18 AM

Quote:

Originally Posted by BernieB

Defective master... Slow pedal drop with steady pressure, and no leaks anywhere. Nothing else it could be.

That gets my vote.

BernieB · 11-02-2009, 12:32 PM

Quote:

Originally Posted by leolkfrm

front caliper hoses may be starting to collapse, causing slow fluid flow

If true he'd have almost no braking at all until enough fluid went through to move the caliper pistons. Since he does have braking, just a sinking pedal, I'll stick with my bad master diagnosis.

gmctrucks · 11-03-2009, 06:35 AM

Lets us know what it was?????????????????
Thanks! GMC
PS-Please don't leave us hanging.

11-01-2009, 07:04 AM	#12
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	ok so you proved air in the lines, did you bleed them so fresh fluid is at each wheel? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-01-2009, 03:25 PM	#15
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	are the back brakes adjusted correctly? __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

11-01-2009, 07:32 PM	#16
BernieB Senior Member Join Date: Jul 2009 Location: Fredericksburg, VA Posts: 1,909	Defective master... Slow pedal drop with steady pressure, and no leaks anywhere. Nothing else it could be. __________________ If the guys who design 'em had to take one home, use it every day for 2 years, and do all the maint and repairs themselves, cars would have a button on the dash to change the oil, filters & plugs.

11-02-2009, 04:47 AM	#17
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	front caliper hoses may be starting to collapse, causing slow fluid flow __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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11-01-2009, 11:17 AM	#13
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,035	I would bleed the whole system again.

11-01-2009, 03:21 PM	#14
ltracer91r Full Member Join Date: Aug 2009 Location: Northern California Posts: 14	the whole system has been bled numerous times, with fresh fluid and no air at every wheel. I'm thinking I might rebuild the front calipers, or replace.

11-03-2009, 06:35 AM	#20
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,035	Lets us know what it was????????????????? Thanks! GMC PS-Please don't leave us hanging.

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