Drum Brake Hydraulic Wheel Cylinders – Renewal of Seals and Cylinders

If the wheel cylinders show signs of leakage, or of piston being seized up, then it will be necessary to dismantle them and fit new seals. The cylinders in the front brakes have one piston and seal each. To renew the seals it is not necessary to remove the cylinder but the wheel, brake drum, and brake shoes must all be taken off. Seal the cap of the hydraulic fluid reservoir with a piece of plastic film to minimise fluid loss from the system.

Pull the rubber boot off the end of the cylinder and pull the piston out of the cylinder. If the piston is stuck tie up the opposite cylinder to prevent the piston coming out and depress the brake pedal to force the piston out. In extreme cases of seizure the cylinder must be renewed completely.

Front wheel hydraulic brake cylinder

1968 - 1979 VW 1600 Transporter Drum Brake Hydraulic Wheel Cylinders

1. Boot
2. Piston
3. Cup
4. Housing
5. Bleed valve
6. Dust cap
7. Adjusting nut
8. Adjusting screw

Rear wheel hydraulic brake cylinder

1968 - 1979 VW 1600 Transporter Drum Brake Hydraulic Wheel Cylinders -2

1. Boot
2. Piston
3. Seal
4. Circlip
5. Housing
6. Bleed valve
7. Dust cap

Share and Enjoy:
  • Print
  • Digg
  • StumbleUpon
  • del.icio.us
  • Facebook
  • Yahoo! Buzz
  • Twitter
  • Google Bookmarks