Caliper or Master?
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
Caliper or Master?
Rebuilt driver front caliper (piston came out while off rotor for other work). Have bleed front brakes 3 times and warning light still comes on. It will reset but comes back with next hard brake. Verified it is not e-brake and wire is on sensor good. My guess is something wrong with caliper rebuild (but no visible leaks) or master went bad due to fluid being drained. It was several days between caliper removed and ordered parts coming in.
Any way to troubleshoot farther or just take a guess and R&R one of them? Asked local mechanic who said "I don't rebuild those calipers, I just replace them".
Any way to troubleshoot farther or just take a guess and R&R one of them? Asked local mechanic who said "I don't rebuild those calipers, I just replace them".
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
not both
Only the front reservoir went dry, only the driver front caliper was removed. Rear system should have not changed should it?
Last edited by dburgjohn; Dec 29, 2008 at 04:41 PM. Reason: add txt
Racer
Joined: Nov 2008
Posts: 293
Likes: 1
From: Eaton Ohio
As Dogboy said, try bleeding the master cylinder.. you said the front reservoir went dry, but one did go dry...if you have air in your master cylinder it will greatly reduce your fluid pressure, you need to bench bleed it. for this you can just plug the two holes of the MC or you can attach a hose to it pointed back into the reservoir. If you do it on your car, depress the brake pedal extreamly slow repeadly untill no more bubbles appear when the brake is depressed, also the car/MC must be level when you do this. If you take the MC off your car...make sure it is kept level and use a blunt object to depress the plunger just 3/4 an inch until no bubbles appear.
Note...when you disconnect the lines to the MC you will need to bleed all four calipers... Right Rear, Left Rear, Front Right, Front Left
Good Luck!
Note...when you disconnect the lines to the MC you will need to bleed all four calipers... Right Rear, Left Rear, Front Right, Front Left
Good Luck!
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
you still have a bubble in there somewhere. The switch turns on the light when there is a pressure imballance below the block, its there so its got to come out. Before spending $$ on parts get a big can of brake fluid and get after it.
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Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,076
Likes: 281
From: Dyersburg TN
bubble must be
the air must be in the front of the MC. does anyone here know if I can lower the front end to level the MC on the car? I really don't want to risk twisting off the rear bleeders if I don't have to.
Melting Slicks
Joined: Dec 2006
Posts: 2,669
Likes: 3
From: Kingston Ontario
Remove master cylinder and bench bleed until no evidence of air. Trying to bleed the master on the car, will lead you to
.The light will continue to illuminate as long as you have air the master.
