Ford Focus 2000-05

Diagnosis & Testing


The technician should have a thorough knowledge of the brake system operation and accepted general braking guidelines in order to detect any problems.

Select a road that is reasonably smooth and level. Gravel or bumpy roads are not suitable because the surface does not allow the tires to grip the road equally. Avoid crowned roads.

A key factor in evaluating brake concerns is the deceleration rate. This varies from vehicle to vehicle and with changes in operating conditions. It is evident how well the brakes are working after just a few applications.

For low or spongy brake pedal concerns:

Check and, if necessary, refill the brake master cylinder reservoir.
Bleed the brake system and retest the brake pedal feel.
If the brake pedal is still low or feels spongy, check the brake pedal mounting for looseness and correct installation. Check the brake booster and the brake master cylinder for loose mounting. Correct as necessary and retest the system for normal operation.

For a slow or incomplete brake pedal return concern:

Inspect for binding, damage, incorrect installation or interference at the brake pedal.
Check the brake booster for binding, damage and incorrect installation.

  1. Verify the customer concern.
  3. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart
Wheel speed sensor HCU Incorrectly inflated tires Ford specified steering components, suspension components and tire size Wheel speed sensor ringBattery junction box (BJB) fuse(s) 11 (30A) 21 (20A) 29 (10A) (vehicles built after 11/2004) Central junction box (CJB) fuse 46 (7.5A) (vehicles built before 11/2004) Circuitry ABS module Traction control switch Wheel speed sensor

Further inspection on the ABS system requires the use of a scan tool and proper software. If you do not have the equipment or training necessary, refer the vehicle to a qualified repair facility.