E 350 V10-6.8L (2007)
Brake Master Cylinder: Testing and Inspection
Compensator Port Check
Compensator Port Check
WARNING: Use of other than the approved DOT 3 brake fluid will cause permanent damage to the brake components and will render the
brakes inoperative.
NOTE: If a vehicle with a locked wheel must be moved, loosen the bleeder screw to relieve pressure.
Always check brake fluid level and, if necessary, fill with clean, specified brake fluid.
The purpose of the compensator ports in the brake master cylinder is to supply any additional brake fluid required by the system due to brake pad
wear, and to allow brake fluid returning from the brake hoses and tubes to the brake master cylinder to enter the brake master cylinder reservoir.
The returning brake fluid will cause a slight turbulence in the brake master cylinder reservoir. Turbulence seen in the brake master cylinder reservoir
upon release of the brake pedal is normal and shows that the compensating ports are not plugged.
