Seat Leon >> Removing and installing brake master cylinder

Removing and installing brake master cylinder, LHD

Special tools and workshop equipment required

  • Torque wrenches - V.A.G 1331-

Brakes - hydraulics

  • Brake filling and bleeding equipment - VAS 5234-

Brakes - hydraulics

Removing:

  • Remove the brake fluid reservoir.
  • Remove brake light switch - F-.
  • Disconnect brake lines -1- from brake master cylinder and seal brake lines with plugs from repair kit.
  • Unscrew securing nuts -2- for brake master cylinder.

Brakes - hydraulics

Note A heat shield is fitted on the brake master cylinder on some models.

  • Detach heat shield if fitted.
  • Detach brake master cylinder from brake servo.
  • Remove brake master cylinder from vehicle.
Caution

Brake fluid must not be allowed to enter the brake servo.

Installation:

Note Before assembly, install the brake light switch - F- in the brake master cylinder.

  • Install brake light switch - F-
Caution

Brake fluid must not be allowed to enter the brake servo.

  • Replace the seal between the brake master cylinder and the servo brake.
  • When fitting the brake master cylinder, ensure that the control rod in the servo brake seats correctly.
  • Put on new nuts -2- and tighten to required torque.

Brakes - hydraulics

Note A heat shield is fitted on the brake master cylinder on some models.

  • Connect brake lines -1- to brake master cylinder. Note tightening torque.
  • Install heat shield if previously removed.
  • Connect the electric connector to the brake light switch - F- .
  • Install brake fluid reservoir.

Brakes - hydraulics

Note Plug in electrical connector for brake fluid level warning contact - -F34-- .

Note

  • The brake light switch - F- does not have to be calibrated.
  • Before the first journey, check that the brake light switch - F- is functioning without fault.

 

  • Bleed brake system

Vehicles with clutch

  • Bleeding clutch hydraulics system

Tightening torques:

  • Tightening torques for heat shield nuts: 20 Nm

Removing and installing brake master cylinder; RHD

Note If there are problems with the brake servo, first check the brake servo vacuum system

Special tools and workshop equipment required

  • Torque wrenches - V.A.G 1331-

Brakes - hydraulics

  • Brake filling and bleeding equipment - VAS 5234-

Brakes - hydraulics

Fitting location of brake servo in RHD vehicles:

  1. - Brake servo and brake master cylinder
  2. - ABS hydraulic unit - N55- and ABS control unit - J104-

Brakes - hydraulics

Removing:

  • Remove brake light switch - F-

Vehicles with air conditioning

  • Drain air conditioning system .
  • Unscrew nuts -2- on refrigerant line -1-.
  • Remove refrigerant line -1-.

Continued for all vehicles

  • Remove the brake fluid reservoir.

Brakes - hydraulics

  • Removing brake lines -2- on master brake cylinder -1-.
  • Seal brake pipes with sealing plugs from repair kit Part No. 1H0 698 311 A.
  • Unscrew nuts - arrows -.
  • Remove heat shield -3-.
  • Carefully remove brake master cylinder from brake servo.

Brakes - hydraulics

Installation:

Carry out installation in the reverse sequence, noting the following:

  • When assembling brake master cylinder with brake servo, make sure plunger rod is properly positioned in brake master cylinder.
  • When assembling brake master cylinder with brake servo, make sure seal is properly seated.
  • Ensure that seals are correctly seated in brake master cylinder.
  • Moisten sealing plugs with brake fluid before pressing brake fluid reservoir into brake master cylinder.
  • Bleed brake system

Vehicles with manual gearboxes

  • Bleed clutch control mechanism .

Vehicles with air conditioning

  • Top up coolant .

Tightening torques:

  • Front bleed valves
  • Rear bleed valves
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