Need brake help
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Need brake help
New MC is on the car and I am trying to bleed the new MC and the rear bleeds fine, but the nothing is coming out of the front.
Do I have a defective MC or am I doing something wrong?
Oh yea, I put bleeder hoses on.
Do I have a defective MC or am I doing something wrong?
Oh yea, I put bleeder hoses on.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
IMHO new master cylinders need to be bled at the work bench before installation to get all the air out. Since you already have it installed try letting it sit overnight. If you are not able to get the fronts to bleed after it sits overnight get a helper to work the brake pedal & bleed it at the master cylinder line connection the old fashioned way.
Pedal down & hold, loosen the line nut, tighten the line nut, pedal up.
Repeat as necessary until fluid comes out of the connection.
Pedal down & hold, loosen the line nut, tighten the line nut, pedal up.
Repeat as necessary until fluid comes out of the connection.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Did you bench bleed both ports of the master before you installed it. By doing a per-bleed you can check the master and see if it is working proper by placing your finger over the port and feeling the pressure.
If it was stoping before the change out, both of the front lines have to be good.
What bleeding method are you using?
And what do you mean by a bleeder hose? (doing a pre-bleed).
If it was stoping before the change out, both of the front lines have to be good.
What bleeding method are you using?
And what do you mean by a bleeder hose? (doing a pre-bleed).
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Check to see if the proportional valve is centered. Look in the hole where the (near the bottom) sensor mounts with the prong sticking out of it to see if the valve is centered. If not centered the sensor will not mount I believe. If is master off the car, you should be able to see both sides of the “U” shaped area and should have some depth. If the valve is moved to one side it will be almost flush with inner wall of housing. You can move with a screwdriver (gently) to check it.
With both sides not bleeding it is unlikely the flex lines, caliper or ABS could be the problem. I just can’t buy that at this time.
Only one left field idea would be both bleeder valves on each caliper is clogged. Take them out and clean them if they are in question.
With both sides not bleeding it is unlikely the flex lines, caliper or ABS could be the problem. I just can’t buy that at this time.
Only one left field idea would be both bleeder valves on each caliper is clogged. Take them out and clean them if they are in question.
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