Author Topic: Disc Brakes  (Read 10484 times)

keith fowler

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Disc Brakes
« on: June 28, 2013, 08:26:48 AM »
Can anybody help me to buy a master cylinder for my converted 66Coupe.
I have fitted disc brakes all round 10" but now my dual circuit master cylinder gives a soft peddle.
Blanked off rear brakes and I get a peddle ,leading me to believe that the rear needs greater volume to feed the calipers instead of wheel cylinders as before.
Looked on another forum (USA) and they talked about BMC SOV cylinders I take it they are not talking about the old BMC that turned into BL.


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Re: Disc Brakes
« Reply #1 on: June 29, 2013, 02:40:51 PM »
If the parking brake system on the rear calipers is not correctly adjusted you will have the symptoms you describe.  Have you properly adjusted the parking brake?

Are you sure that you properly bled the master cylinder (it's a separate process from bleeding the brake lines)?

How did you block off the rear brakes?  If you just capped the line your master cylinder would not move much, if at all because the fluid for the rear circuit has no place to go.  You would probably get the same indication if you blocked off the front brake circuit.

Are the piston diameters in the front and the rear calipers the same or different?


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Re: Disc Brakes
« Reply #2 on: September 17, 2013, 06:12:56 PM »
Did you by chance put in a proportioning valve in the rear line if not do so as if you haven it will create this problem and also cause the rear brakes to drag causing wear. Also did you use a booster? If you did power brakes use a different Pedal pressure then drums the pin in the Pedal will need to be revised. If you didn't do a booster then you still need to have this problem fixed. If questions on that pm me. Also have you bench bled the master before install if not you need to as you may still have air even though you most likely bled the system after converting


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Re: Disc Brakes
« Reply #3 on: September 24, 2013, 01:58:08 PM »
The slide pin might be stuck

Stuck Brake Caliper Slide Pin "How to"



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