brakes, no pressure - Team Camaro Tech
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post #1 of 4 (permalink) Old Jun 19th, 02, 06:59 PM Thread Starter
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this seems like a no brainer but i cannot figure this out, I have a 68 that runs four corner disc manual brakes. Cannot get the pressure to build up. Bled from the farthest line to the master , nothing pressure would build up peddle stay hard, release , nothing.. So i changed the master cylinder. primed it re -bled, nothing same thing. You pump up the brakes you have pressure, but soon as you release,, nothing It stays hard , the peddle does not go down after you pump up and hold the peddle. i checked all the lines for leakes , nothing. Help me oh holy ones. I have a screamer of a car. BUT it does no good if it doesn't stop
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post #2 of 4 (permalink) Old Jun 19th, 02, 07:36 PM
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Try gravity bleeding the system. It's time consuming but it usually works. Start with the right rear, open the bleeder and just let it drip while you keep an eye on the fluid in the master cylinder. Let it drip until you've replaced all the fluid in the master cylinder. Close it and go to the left rear and let it drip for at least half of the fluid in the master. Do the same for the front starting with the right side. Just don't let the master run dry.

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post #3 of 4 (permalink) Old Jun 20th, 02, 01:20 AM
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Are the manual disk brakes original equipment or changeover from drum?

Is the master cylinder original equipment for drum brakes or manual disc brakes?

It sounds like the master cylinder may be too small of diameter for disc brakes, push rod for master cylinder may be in the wrong hole on brake pedal, or, improperly adjusted push rod length.

Adjust push rod length for 1/16-1/8 inch of play. Place push rod in lower hole of brake pedal for more stroke.

Does it always take the same amount of stroking the brake pedal to acquire a stiff pedal? If it does, m/c not large enough of diameter.

Remove m/c top, and VERY slowy press on brake pedal to see if any air bubbles come from m/c bore.

Probably still have air in the lines.

The above are suggestions as to what might be the problem, however, I feel the brakes worked fine before the change out of front brakes hoses.

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post #4 of 4 (permalink) Old Jun 20th, 02, 07:39 PM Thread Starter
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I have a friend who also suggested the gravity bleed thing. I looked at him like he was nuts but now you are the second person that suggested that. I will try that this weekend.I'll let you all know thg results. Thank for the speedy reploe <BLOCKQUOTE>quote:</font><HR>Originally posted by Atth2o:
this seems like a no brainer but i cannot figure this out, I have a 68 that runs four corner disc manual brakes. Cannot get the pressure to build up. Bled from the farthest line to the master , nothing pressure would build up peddle stay hard, release , nothing.. So i changed the master cylinder. primed it re -bled, nothing same thing. You pump up the brakes you have pressure, but soon as you release,, nothing It stays hard , the peddle does not go down after you pump up and hold the peddle. i checked all the lines for leakes , nothing. Help me oh holy ones. I have a screamer of a car. BUT it does no good if it doesn't stop<HR></BLOCKQUOTE>

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