installed front disc brakes

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Dec 3, 2018 | 04:35 PM

danno1965

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installed front disc brakes

installed front disc brake kit, blead the brakes around 7 times each wheel, no leaks any place, but if I let it set for awhile and then go back and hit the brakes pedal goes to the floor, then on the second pump I will get a good pedal. this is on a 65 F-100 4WD. Already had power drum brakes so I used the same booster and master cylinder, any ideas what's wrong!!! thank

Dec 3, 2018 | 08:33 PM

wauto

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From: Dysart, Iowa

Are the bleeders on the top of the calipers?

Dec 4, 2018 | 07:10 AM

danno1965

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for sure, I did that one time long ago and learned my lesson.

Mar 17, 2020 | 02:45 PM

Sam Winn

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I don’t have automatic adjusters but I do agree that the shoes are probably just too lose after watching a few video.. I’ll have to check it out

Mar 17, 2020 | 03:55 PM

85e150

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You using a single pot master? I don't think that's going to work very well with a disc/drum setup. Pressures are different, etc.

Mar 17, 2020 | 05:32 PM

NumberDummy

Ford Parts Specialist

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From: Simi Valley, CA

F100 4WD's didn't have self adjusting brakes until 1967.

Mar 17, 2020 | 08:07 PM

gcooter

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From: South of Madison WI.

Disk brakes take less pressure to operate than drum brakes. The master cylinder will be different in a disk/drum setup than it is in a drum/drum setup. The disk brakes have a larger piston and no springs like the drum brakes do. A master cylinder setup for disk/drum will have a built in metering block in combination with the proportioning valve. Another thing to try is to have residual valves in the brake lines. I bought some several years ago from Speedway Motors. They sell a 2 PSI residual valve for disk brakes and a 10 PSI residual valve for the drum brakes. The valves hold a bit of back pressure in the lines so your pedal does not go soft. It is a kind of a one way valve.

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Mar 17, 2020 | 09:27 PM

Rollbar

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From: Florida

Quote:

Originally Posted by gcooter

Another thing to try is to have residual valves in the brake lines. I bought some several years ago from Speedway Motors. They sell a 2 PSI residual valve for disk brakes and a 10 PSI residual valve for the drum brakes. The valves hold a bit of back pressure in the lines so your pedal does not go soft. It is a kind of a one way valve.

Did you use the valve on drum or disk?
Did you like them?
Thanks,

Mar 17, 2020 | 09:54 PM

#10

gcooter

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From: South of Madison WI.

I used the drum valve. I have a dual master cylinder and used one on the brake line going to the front and the other to the rear line. Both are the 10 PSI valve. I have a 1964 F250 with a camper built onto the bed. It weighs a ton and is hard to get stopped. The residual valves really help with the dead pedal problems.