Villager V6-181 3.0L SOHC VIN 1 EFI (1997)
Brake Master Cylinder: Initial Inspection and Diagnostic Overview
Normal/Abnormal Conditions
NORMAL CONDITIONS
The following conditions are considered normal and are not indications that the brake master cylinder is in need of service.
Condition 1:
During normal operation of the brake master cylinder, the brake fluid level in the brake master cylinder reservoir will rise during
brake application and fall during release. The net brake fluid level (i.e., after brake application and release) will remain
unchanged.
Condition 2:
A trace of brake fluid will exist on the power brake booster shell below the brake master cylinder mounting flange. This results
from the normal lubricating action of the brake master cylinder bore and seal.
Condition 3:
Brake fluid level will decrease with brake shoe and lining wear.
ABNORMAL CONDITIONS
Changes in brake pedal feel or travel are indicators that something could be wrong in the brake system. Refer to Symptom Chart for abnormal
condition diagnosis.
Inspection
Check the brake tubes and brake master cylinder mounting. The brake tubes and brake tube flare nuts must be tight without any signs of leakage. Tighten
the brake tube flare nuts at the brake master cylinder to 15-18 Nm (11-13 ft. lbs.).
The following conditions are considered normal and are not indications that the brake master cylinder is in need of service:
^
Low brake fluid level detected without signs of leakage. This condition is caused by displacement of brake fluid from the brake master cylinder
reservoir into the front disc brake calipers and/or the rear wheel cylinders to compensate for normal brake wear. Add brake fluid as needed.
^
A momentary or slight squirt of brake fluid from the brake master cylinder reservoir upon application of the brake pedal. This condition is caused
by brake fluid displacement through the brake master cylinder reservoir compensating port as the brake master cylinder pistons move forward in
the bore when the brakes are applied.
^
Slight turbulence in the brake master cylinder reservoir fluid when the brake pedal is released. Turbulence occurs as brake fluid returns to the
brake master cylinder after releasing the brakes.
^
A trace of brake fluid found on the outside of the power brake booster below the brake master cylinder mounting flange. This condition results
from the lubricating action of the brake master cylinder wiping seal.