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Adjusting Rear Brakes 72 240Z


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72 240Z with sbc 350: After fitting all new front and rear brake parts and putting about 300 miles on the pads (KVR) and shoes (OEM) I am having a problem with rear wheel lock up on heavy braking. Either the left or right wheel will lock up. The fronts will not lock up at all.

 

Originally I adjusted the rears to where the drums just dragged on the shoes, but either the left or right wheel would lockup on hard braking. So I then backed off both sides, but either the left or right wheel will still lock up under hard braking. Slackening the adjustment further compounds the problem by increasing pedal travel.

 

I am considering that I may need to install an adjustable proportioning valve to balance the front and rear braking in an effort to prevent the rear wheel lock up problem.

 

What is the best approach for adding an adjustable PV?

 

How do you get the rear brakes adjusted evenly?

 

Any help would be appreciated.

 

Thanks

 

Miles

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