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disc brake problem


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I recently purchased a 1974 Datsun 1600 pu with disc brakes. My problem is the front keep locking up and i was told it was because I had the original 1 line master cylinder for drum brakes on it. Is there a direct replacement for the disc brake set up, I know I would have to rebuild my brake lines to fit if there is.

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Interesting. I believe you have a poorly made custom brake setup. The 1974 Datsun 620 should have a brake booster with two hydralic lines and it would also have four wheel drum brakes.

 

We would love some pictures of the brake master, the front suspension, and brakes. Perhaps some of it was welded on from a later datsun truck that had discs in front.

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Drum brakes have a higher pressure (10lb vs 2lb?) residual valve, so it could be that. The valve is in the master cylinder where the brake line connects. Also, check that you have some amount of free play between the brake pedal rod and the master cylinder. At rest, the rod should be loose enough that it's not holding the master cylinder "in" at all.

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