A
Hydraulic, Power Assist, and Parking Brake Systems Diagnosis and Repair
19 scored · 43%- A.1Diagnose poor stopping, dragging, high or low pedal, and hard or spongy pedal caused by the master cylinder; determine needed repairs.
- A.2Measure and adjust master cylinder pushrod length.
- A.3Check master cylinder for failures by pressing brake pedal; determine needed repairs.
- A.4Diagnose the cause of master cylinder external fluid leakage.
- A.5Remove and replace master cylinder; bench bleed and install master cylinder; verify master cylinder function.
- A.6Diagnose poor stopping, pulling or dragging caused by problems in the lines and hoses; determine needed repairs.
- A.7Inspect brake lines and fittings for leaks, dents, kinks, rust, cracks or wear; inspect for loose fittings and supports; determine needed repairs.
- A.8Inspect flexible brake hoses for leaks, kinks, cracks, bulging, wear or corrosion; inspect for loose fittings and supports; determine needed repairs.
- A.9Replace brake lines, hoses, fittings and supports; fabricate brake lines using proper material and flaring procedures (double flare and ISO types).
- A.10Inspect brake lines and hoses for proper routing and support.
- A.11Diagnose poor stopping, pulling or dragging caused by problems in the hydraulic system valve(s); determine needed repairs.
- A.12Inspect, test and replace metering, proportioning, pressure differential and combination valves.
- A.13Inspect, test, replace and adjust load or height sensing-type proportioning valve(s).
- A.14Inspect, test and replace brake system warning lights, indicators, switches, sensors and circuits; test, adjust and repair or replace brake stop light/brake pedal position switch sensor, lamps and related circuits.
- A.15Diagnose poor stopping, pulling, dragging or incorrect pedal travel caused by problems in the brake fluid; determine needed repairs.
- A.16Bleed and/or flush hydraulic system using manual, pressure, vacuum or gravity method(s).
- A.17Pressure test brake hydraulic system.
- A.18Select, handle, store and install proper brake fluids (including silicone fluids). Fill master cylinder to proper level.
- A.19Inspect and test brake pedal linkage for binding, looseness and adjustment; determine needed repairs.
- A.20Test pedal free travel with and without engine running to check power booster operation.
- A.21Check vacuum supply (manifold or auxiliary pump) to vacuum-type power booster.
- A.22Diagnose vacuum-type power booster unit for vacuum leaks and proper operation; inspect the check valve for proper operation; repair, adjust or replace parts as necessary.
- A.23Diagnose hydro-boost system for leaks and proper operation; repair or replace parts as necessary; refill and bleed system following manufacturers' specifications.
- A.24Diagnose electronic brake servo/brake simulator system for proper operation; determine needed repairs.
- A.25Diagnose parking brake system operation (including electronic parking brakes); inspect cables and parts for wear, rust and corrosion; clean or replace parts as necessary; lubricate assembly.
- A.26Adjust parking brake assembly; check operation.
- A.27Test the parking brake indicator light, switch and wiring.
- A.28Retract integral and/or electronic parking brake caliper piston(s) according to manufacturers' specifications.
- A.29Adjust calipers with integrated parking brakes according to manufacturers' recommendations.