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Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc


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Old 11-18-2020, 05:49 PM
RK_67_FS_SWB RK_67_FS_SWB is online now
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Default Disc Brake Conversion and Proportioning Valves

My 67 currently has a drum/drum setup. Sometime in the not so distant past the previous owner upgraded the brake system with a master cylinder-vacuum booster combo. In the future I plan on going to a disc/drum or perhaps a disc/disc setup. My question is am I going to need a new master cylinder and booster at that time or just the appropriate proportioning valve?
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Old 11-22-2020, 11:52 AM
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A brake booster is for Power brakes weather it be drum/drum or disc/drum or even disc/disc. A Distribution Valve is for drum brakes period. The Proportioning Valve is for any combination for disc brakes involved period.
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Old 12-10-2020, 09:39 AM
Fussy&Grumpy Fussy&Grumpy is online now
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I agree with mjGord entirely. I will add to this a bit.

When upgrading or altering any braking system, it is critical you do it correctly. Correctly in this case MAY mean spending a bit more money and time, yet the headaches getting it ironed out are considerably less.
Many of the companies offering disc brake kits will also provide the correct part numbers for many of the additional parts required (ie: when adding discs to the front, you need this proportioning valve and this master cylinder) and this in itself is priceless. There are some pretty smart people out there who have done all the testing and figuring everything out, then were gracious enough to share that knowledge and experience - take advantage of it.

As I live in Canada, one of the considerations I made when I chose a disc brake kit for my '86 was availability of replacement parts. I would have LOVED a complete Wilwood setup, however with reliability in shipping being quite erratic lately, I chose a kit based on Cadillac parts.

I can not stress enough to follow the manufacturer's directions and never be afraid to call their support line if required - they spent money putting people there for questions.

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Old 12-12-2020, 12:57 PM
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Case in point about mismatched brake and steering parts. Here is how my truck was equipped when I took possession of it. 68 C10 with 1992 front disc brake system= backing plates, calipers, spindles and a 71-72 period correct center link mated up to the trucks Original upper ball joints and probably its lower ball joints (wrong), a two port reservoir with a "distribution block" (no power booster). WOW not a good combination of parts mismatched all the way, you know very much back yard thinking or should I say using NO thought at all. I did drive it first be for forking over some cash and the test drive showed when stopping I had to STAND ON THE BRAKE PEDDLE TO STOP. Up to speed 55mph the steering did do the wheel wobbles quite a bit, again mismatched steering parts there. All of the parts for the brake system and the steering system wasn't meant to be married together AT ALL. I bought it and had AAA get it home for me as I wasn't going to take the chance of it "especially not stopping" correctly.

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Last edited by mjgord51; 12-12-2020 at 01:00 PM.
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