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post #1 of 8 (permalink) Old May 20th, 07, 05:31 AM Thread Starter
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Valves

My 67 has single piston calipers on the front off a 70 chevelle. The master is original drum brake type with no proportional valve or any other valves for that matter. The system seems to work just fine. My question is do I need to add valves and change master when I add line-loc?

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post #2 of 8 (permalink) Old May 21st, 07, 03:53 PM Thread Starter
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Re: Valves

Anybody???? I see the lights are on, anybody........

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post #3 of 8 (permalink) Old May 21st, 07, 06:18 PM
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Re: Valves

No - all the line lock does is prevent the fronts from draining pressure. If your brakes work well now you can just leave 'em alone.
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post #4 of 8 (permalink) Old May 22nd, 07, 04:32 PM Thread Starter
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Re: Valves

Thanks rod67ss. Just can't understand why they make proportioning valves and different master cylinders when "one size" seems to work all.

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post #5 of 8 (permalink) Old May 22nd, 07, 06:10 PM
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Re: Valves

Since disc cylinders have larger resivoirs there must be some reason. Could be a temperature issue... or maybe just a bigger safety margin. Anyone know for sure???
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post #6 of 8 (permalink) Old May 25th, 07, 07:13 PM Thread Starter
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Re: Valves

Quote:
Originally Posted by rod67ss View Post
Since disc cylinders have larger resivoirs there must be some reason. Could be a temperature issue... or maybe just a bigger safety margin. Anyone know for sure???
I guess not

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post #7 of 8 (permalink) Old May 25th, 07, 07:27 PM
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Re: Valves

on a 4 wheel drum braking system all brakes apply the same pressure. on front disk to rear drum 60-40. 60 is on front 40 is on rear.you may not notice till you upgrade to disk brake master.and also put in proper pro valve.
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post #8 of 8 (permalink) Old Jun 3rd, 07, 11:09 AM
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Re: Valves

Master cylinders have to have the correct piston diameter to move the fluid volume requirement of the system they are used on. Generally disc has a greater volume requirement than drum. Go to wilwood and other aftermarket brake websites and you can read to your hearts content.

A disc/drum combo should have a proportioning valve. There are even adjustable ones.

Usually the proportioning valves on OEM disc/drum combos also incorporate a residual pressure valve on the drums hydraulics, in order to keep a few pounds pressure on that system because of the heavy springs on the pads. Hope this helps some.

Tim Smith
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