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Q:

brakes grabbing on 1994 Lexus LS400

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
On normal brake applications when stopping the brakes grab and make a knocking/thumping noise and when i get up off the brakes it stops only on the right rear disc brake.
(2) Answers
sounds like you have hyraulic issues. take it to a shop and have them check the master cylinder for operation and the brake hoses and calipers.

Roy
Sounds like caliper movement problems causing uneven braking and/or hanging up even when pedal is released. As mastertech6371 says-get it checked asap.