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Home >> Toyota >> 1990 >> 4Runner 2D Utility, 2.4 R, Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Description & Operation

Description & Operation

WARNING: For warnings and procedures regarding vehicles equipped with Anti-Lock Brake Systems (ABS), see appropriate ANTI-LOCK BRAKES article.
NOTE: Pickup in this article includes Cab and Chassis (C & C) with Single Rear Wheels (SRW) and Dual Rear Wheels (DRW).

The hydraulic brake system uses a tandem master cylinder with a vacuum power assist servo. All models are equipped with front disc and rear drum brakes.

A load-sensing proportioning valve is used on some models to regulate brake pressure between front and rear brakes. The rear brakes on all models are self-adjusting.

The parking brake lever mechanically activates rear brakes. On models with rear drum brakes, a cable applies rear shoes.