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i have a 1975 corvette. i have replaced the front ...
Sent to Chevy Experts July 04 11:07 PM

i have a 1975 corvette. i have replaced the front calipers, master cyl. and booster. i am getting fluid to all wheels and some pressure on the pedal after it is bled but as soon as i start the car the pedal will go right to the floor with no brakes.

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
July 4 11:15 PM (7 minutes and 53 seconds later)
         
REPLIEDCheck Mark
Did you bench bleed the master cylinder before installation? Sometimes they trap air and don't allow the pedal to pump up with pressure. Also, try taking cap off master cylinder, open all bleeder screws at the wheels and gravity bleed the system until no air coming out (steady little streams). Close the bleeders and top off fluid. Retest and let me know what you come up with ok.

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Dan -- Auto Technician -- 99% Positive Feedback on 1330 Chevy Accepts
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Reply
July 4 11:18 PM (3 minutes later)
         
Reply to Dan's Post: i did bench bleed the cyl. the car has dual calipers on back, is there a special procedure?
Customer (name blocked for privacy)
Answer
July 4 11:22 PM (4 minutes and 1 second later)
         
REPLIEDCheck Mark
No special procedure. Just make sure the car is level so the gravity bleeding doesn't have to fight gravity. It should get out any air in the system one bubble at a time. May take a little while but I have found very effecttive. Also make sure the master cylinder stays full of fluid when bleeding ok.

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Dan -- Auto Technician -- 99% Positive Feedback on 1330 Chevy Accepts
GM Mark of Excellence/ Service Guild Participant with 13 years experience
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July 4 11:29 PM (7 minutes and 13 seconds later)
         
Reply to Dan's Post: the mechanic said they did gravity bleed the car.why would there be a fairly hard pedal with the car off and as soon as it is started the pedal goes to the floor
Customer (name blocked for privacy)
Info Request
July 4 11:37 PM (7 minutes and 27 seconds later)
         
REPLIED to Info RequestCheck Mark

Does it have a vacum brake booster or hydroboost usingt the power steering?



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Dan -- Auto Technician -- 99% Positive Feedback on 1330 Chevy Accepts
GM Mark of Excellence/ Service Guild Participant with 13 years experience
Reply
July 4 11:39 PM (1 minute and 43 seconds later)
         
Reply to Dan's Post: i believe it has vacuum boost
Customer (name blocked for privacy)
Answer
July 4 11:42 PM (3 minutes and 7 seconds later)
         
ACCEPTEDCheck Mark
Ok, then check the vacum booster check valve and the booster itself. Can you hear a swooshing noise when the car is started and the brakes are applied? If so then the booster may be faulty. Try disconnecting the big vacum line to the booster and plug it off. Try using the brakes and you should have manual brakes (in theory) like older vehicles used to have.

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Dan -- Auto Technician -- 99% Positive Feedback on 1330 Chevy Accepts
GM Mark of Excellence/ Service Guild Participant with 13 years experience
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