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Old 11-20-2010, 05:18 PM
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drum to disc help.

I changed my front drums to disc. on 56 chev. Got a new master cyl. that fits a few gm cars, such as a 70 monte carlo etc. The rod on my old single cyl. is the same length as the new master cyl. I have a proportioning valve added in the rear brake line. I have bled the brakes over and over and can not get any air at mc or any wheel, but the pedal seems to bottom out even though I do have some brakes being applied. I can see the discs moving in and out and the drums grabbing also. I had to add a new line from master cyl. as I only had one doing the job on old mc. The rear brake line I added is 3/16 and comes out of the smaller hole in mc towards front of car and the larger 1/4 line goes to front disc. brakes at back of mc near firewall. I wonder if I have a problem with my setup either at mc or proportioning valve or line size?
Any thought? Thanks. PS. I meant to also say that the rod depth in both master cyls. is identical.

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Old 11-20-2010, 05:32 PM
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Did you bench bleed the master cylinder before installing? If not you can do it in the car with plastic fittings and a couple short hoses.
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Old 11-20-2010, 05:46 PM
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I did not bench bleed, but took off cyl later and did. But still did not find any air at cyl or wheels?
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Old 11-20-2010, 05:54 PM
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So you are saying you are not getting any air at all 4 corners but you are getting fluid right ? If so do you have the rear brakes properly adjusted ? And did you adjust the porportion valve correct also?
Also is the M/C a manual or power brake M/C ?
Cole
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Old 11-20-2010, 05:55 PM
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Dumb question but are you sure that the calipers are on the right side?
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Old 11-20-2010, 05:57 PM
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Quote:
Originally Posted by Nastynotch347
Dumb question but are you sure that the calipers are on the right side?
That's not a dumb question at-all. Which dirrection are the bleeder valves pointing up or down ? It does matter.


Cole
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Old 11-20-2010, 06:08 PM
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My bleeder valves are pointing down. I did not see a left or right on the calipers. And I do have fluid at all wheels and the rear brakes are adjusted up.
I did not know that calipers had a certain left or right location.
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Old 11-20-2010, 06:23 PM
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The bleeders need to be on the top, fluid rises up and pushes the air out of the caliper. With them down the fluid pours out and the air stays.
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Old 11-20-2010, 06:47 PM
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I can see the point of bleeders being in the up position. I will go out to the hangar tomorrow and make sure what I really do have as a position with them, and switch sides if they actually are pointing down. By the way, someone asked if I have the propotioning valve adjusted properly. There were no instructions with the valve, but I am getting fluid from the line leaving the valve to the rear brakes as I bleed it there. I guess I`ll just have to drive it when I get the brakes right and see which way to turn it. ?
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Old 11-20-2010, 07:48 PM
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I have seen calipers installed on cars with the bleeders intentionally lower than the high point of the fluid chamber due to caliper bracket placement and wheel clearance issues in the steering. One of the ways to get these properly bled is to remove the caliper from the caliper bracket and hold the caliper in such a way to have the bleed screw pointing up and then bleed out the air, then put the caliper back on the bracket. You may want to try this before you go to the trouble of switching the calipers as it will either prove or disprove this area as the problem.
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Old 11-22-2010, 07:31 PM
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Any updates?
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Old 11-23-2010, 07:57 AM
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Hi, thanks for your interest in my brake problem. I did have my calipers with the bleed valves pointing down, so I switched them, and got a little air out, but the pedal is still lower than I think it should be. I drove it and it stops ok, but does not seem right. I cannot adjust the proportioning valve either way to make a difference. I only got the car up to about 40 mph and did a panic stop to see if the rear locked up, and they seem to apply evenly.
So, its drivable, Not sure where to go from here. Thanks
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Old 11-23-2010, 08:01 AM
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How much free play in the MC actuating rod? You only want enough to just be able to 'feel' it.
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Old 11-23-2010, 08:14 AM
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I`m not sure if I feel any play between when I push the pedal down and when it touches the mc cup? the pedal springs back good and I measured the stock depth of the mc cup and new mc cup and they are identical. My stock mounting mc was a 4 bolt firewall mount, and the new mc a 2 bolt mount, but that seems to engage the mc cup the same.
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