Brake problem
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 33
Likes: 0
From: NORFOLK VA
Brake problem
I have an 89,auto,with 81000miles. My problem started about a month ago. When I applied the brakes they worked fine but when you coutiuned to hold pressure the peddle would slowly go to the floor. My local NAPA said it was either the Master Cylinder or Power Booster 
I replaced both at the same time. The master cylinder was bad from the dealer.I had it replaced but now I cannot get the rear brakes to work. I bench bleed the master cylinder and the front brakes are working. The rear brakes are getting fluid but will not engage. I'm open to any suggestions. Thanks for your help
'
I replaced both at the same time. The master cylinder was bad from the dealer.I had it replaced but now I cannot get the rear brakes to work. I bench bleed the master cylinder and the front brakes are working. The rear brakes are getting fluid but will not engage. I'm open to any suggestions. Thanks for your help'
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 33
Likes: 0
From: NORFOLK VA
]I have an 89,auto,with 81000miles. My problem started about a month ago. When I applied the brakes they worked fine but when you coutiuned to hold pressure the peddle would slowly go to the floor. My local NAPA said it was either the Master Cylinder or Power Booster I replaced both at the same time. The master cylinder was bad from the dealer.I had it replaced but now I cannot get the rear brakes to work. I bench bleed the master cylinder and the front brakes are working. The rear brakes are getting fluid but will not engage. I'm open to any suggestions. Thanks for your help.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Sounds like you have some air in the lines from the MC swap. You'll want to bleed all four brakes....there is specific order in which you should perform the bleeding I believe it is RR, RF, LR, & LF....do a search to confirm the sequence I've given you is correct.
Burning Brakes
Joined: Jun 2005
Posts: 1,191
Likes: 15
From: Wallingford Vermont
The Rule-of-Thumb is to start with the furthest caliper from the master cylinder then work successively in. For most cars that would be RR, then LR, RF, then LF. BUT on '86 and later Corvettes we have the ABS unit behind the driver. So IIRC RF, LF, RR, LR.
The real issue is the air in the system ....
The real issue is the air in the system ....
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 33
Likes: 0
From: NORFOLK VA
Brake problem
I did not install any bias spring. I called myself bleeding the brakes but I guess I quit too soon. Will take yhour advise and redo ii from the start. including the master cylinder forward. Thanks for the advise.
Safety Car
Joined: Dec 2006
Posts: 4,290
Likes: 6
From: St Marys GA
The Rule-of-Thumb is to start with the furthest caliper from the master cylinder then work successively in. For most cars that would be RR, then LR, RF, then LF. BUT on '86 and later Corvettes we have the ABS unit behind the driver. So IIRC RF, LF, RR, LR.
The real issue is the air in the system ....
The real issue is the air in the system ....
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Pro
Joined: Oct 2007
Posts: 739
Likes: 52
From: Reno NV
Hes right. The brake lines and ebtcm are behind driver seat.
Burning Brakes
Joined: Jun 2005
Posts: 1,191
Likes: 15
From: Wallingford Vermont
I'll have to go check my '86 FSM now. I just can't follow the logic for doing a "side"
at a time, but maybe my reasoning is flawed (maybe the ABS unit changes MORE things).
Anyway, I always bleed the snot out the system when I get down to it. I don't really think the order makes that much difference in the long run
RF, RR,
Anyway, I always bleed the snot out the system when I get down to it. I don't really think the order makes that much difference in the long run
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 33
Likes: 0
From: NORFOLK VA
Brake problem
\rotated air in tires, no help,haha. I've always blead them starting with the fartherest to the closest. Will follow the FSM just to be sure. Thanks for all the good advise.