Question about 1987 Chevrolet Corvette

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I have a 1987 roncorvette con sometimes when i put the brakes on they go right to the floor if i pump them once they com right back and may not do this for another month also noticed if car is runing put brakes on and hold them the petel will slowly go down thank you

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  • Chevrolet Master
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My friend, do you have a death wish? You are driving a car with a worn out master cylinder ... you don't know if the car will stop or not. There is no system on any car more important than the one that gets your car, a 3,000+ lb steel projectile, capable of traveling well over 100 miles per hour ... WITH YOU IN IT! to come to a safe and complete stop. If you hurt someone with this car, there is no defense in the court room for you ... You know the brake system requires repair yet you drive it. You must stop this immediately. You must not drive this car until it is repaired! End of Sermon

What you need to do:

At a minimum, I believe you need a newly rebuilt master cylinder in your 23 year old car. You probably need service on all four wheel cykinders, probably new lines and definitely a complete change of the fluid, shoes and pads as appropriate. You should also have all drums and/or rotors turned or replaced. Expect this job to cost at least $1,000.00. It is better to pay this price than to have the car NOT stop and hurt or kill someone on the street and/or you.

Please get your car repaired today.

Thank you for your interest in FixYa.com

Posted on Jun 07, 2010

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  • Master
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Your master cylinder seals are bad. Replace the Master Cylinder immediately. The Master Cylinder can fail at any moment with a loss of braking so do not drive this car until this is repaired. Bench bleed the Master Cylinder before installing and then bleed your brake system after installation. Use this format. Start at RR, then move to LR, then RF, and end at the LF brake caliber.

Posted on Jun 07, 2010

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  • Expert
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Make sure your fluid is topped off and check for leaks around the master cylinder. Also check behind the rear tires the see if there is moisture or fluid leaking from the rear cylinders. You definitly have a pin hole leak somewhere.

Posted on Jun 07, 2010

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  • Expert
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That would be a fluid leak or spent fluid in the braking system flush out and renew the fluid fix the leaks

Posted on Jun 07, 2010

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1 Answer

Brake pedal just started needing to be pumped to engage and smoke coming from behind the back drivers side tire


I have the same truck! You could have a leaking wheel cylinder. Look at the brake drum on the driver rear and see if its wet. also check your brake fluid level. If you are leaking you will be low.
Wheel cyl's are not super hard to do, just make sure you do everything and both sides. also do one side at a time so you can use the other side for reference when putting it all back together.

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did you bench bleed the master cylinder before putting it on car. if not there is air in braking system. you can try this, have someone pump the brakes and hold them. when loosening line the brakes will go to floor, tell person to hold them till line is retightened. loosen one brake line to get trapped air out. close line and have person pump then hold the brakes and repeat above till the brakes go to floor. if this does not get all air out! then bleed at wheels. ( how to bench bleed master cylinder ).----- put in vise, fill resovoir full of brake fluid. use a dowel or similar to pump master cylinder,pump untill fluid is free of air bubbles shoots out that has no more air in it. keep fluid in it or you will get more air in it. when putting on car have fluid in it. as long as you do not loose fluid from lines, you should be ok!! have a good holiday !! if all else fails. be sure there is no leaks at the wheels or brake lines. usually if a wheel cylinder is leaking. you will see this on inside of wheels on backing plate. be sure to fill fluid when done.

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It went to the floor because you had to compressed the piston to get it over the new pads and rotors. The brakes need to be pumped up after you replace pads in order for the pistons to come back in contact with the new pads and take up the gap. Pushing the pedal to the floor is never a good idea and a good way to ruin a master cylinder in older vehicles.

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do it again .. bleed the master cylinder maybe more than once .. I have had this happen before they are tough sometimes to get to take fluid right .. bleed it again till fluid is really flowing right .. your problem is the master cylinder not blead enough yet .. holler if you have more Jerry

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