brakes acting funny?



brakes acting funny?

Postby grumpyvette » September 2nd, 2012, 5:38 pm

hey grumpy? my 1987 corvettes recently started to require a good deal more pedal pressure to stop the car, any ideas?

well if it was my vette Id put it up on the lift ,pull the wheels and do a visual inspection of the pads,rotors and calipers , bleed the brake lines, replace the brake fluid and verify the vacuum line to the brake booster was not leaking, inspect the brake booster and and look over the master cylinder. as a start.
low fluid, a worn part or a leak in the brake booster or vacuum line is the most likely cause, obviously a few pictures and more detailed info on symptoms and noise or any related info on recent changes to the car, mileage since the last brake job ,etc. might help

heres two links to threads with much more info


http://forum.grumpysperformance.com/viewtopic.php?f=34&t=380&hilit=brakes+trouble

viewtopic.php?f=50&t=10345

http://forum.grumpysperformance.com/viewtopic.php?f=34&t=13

viewtopic.php?f=34&t=380&p=15507&hilit=brake+vacuum#p15507

http://corvette.wikia.com/wiki/C4_Brakes_Tech_Paper

HERES bits of useful info, if your engine won,t produce enough vacuum to run brakes ETC. because you installed a long duration cam that reduced low engine rpm speed engine vacuum

http://www.summitracing.com/parts/crn-99590-1/media/instructions

http://static.summitracing.com/global/images/instructions/crn-99590.pdf

http://www.johnstuartpowerbrake.com/Aut ... Pumps.page

viewtopic.php?f=71&t=1287&p=2754&hilit=vacuum+brakes#p2754
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!!
grumpyvette

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Re: brakes acting funny?

Postby grumpyvette » September 2nd, 2012, 6:13 pm

"87vette81big
added this tip,

There has been reports of sudden brake booster failure in a C4 with the factory plastic unit.
And owners are unable to troubleshoot why.
In at least one case, the underside of the brake booster had a hole melted into it.
Sucking in air all the time.
Owners were using full length headers Un Jet Hot Coated with engine tuned on lean side.
Excess heat melted the plastic power brake booster on the bottom hidden from view. "
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!!
grumpyvette

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Site Admin
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Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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