Seat Leon >> Removing and installing brake calliper pistons, vehicles with manual parking brake

SEAT Leon Service and Repair Manual / Brake system / Brakes - hydraulics / Rear brake calliper / Removing and installing brake calliper pistons, vehicles with manual parking brake

Special tools and workshop equipment required

  • Wedge - 3409-

Brakes - hydraulics

  • Opening/closing wrench - T10165-

Brakes - hydraulics

Note

  • Other than removal and installation of the brake calliper piston, no repairs are permitted on the brake calliper.
  • When carrying out repairs, install all parts supplied in repair kit.
  • Use only methylated spirits for cleaning the brake.
  • New brake calipers are filled with brake fluid and are pre-bled.
  • Apply thin coat of assembly paste G 052 150 A2 to brake cylinder, piston and sealing ring.

Removing:

WARNING

Setting the brake piston can only be carried out with the piston compressing tool - T10165- .

  • Fit the wrench open / closed - T10165- on the brake calliper housing piston.
  • Extract the piston from the brake calliper housing by turning the handle on the tool to the left.
  • If the piston will not move easily, a 13 mm open-end spanner can be applied at the flats provided -arrow A-.

  • Remove seal using wedge - 3409- .

Installation:

  • The piston and join ring surfaces can only be cleaned using alcohol and immediately dried.
  • Before fitting the piston and seal ring, apply a thin coating of assembly paste.
  • Introduce the join ring into the brake caliper housing.

  • Fit the protective hood with the outer sealing lip over the piston.

  • Using the removal wedge - 3409- , insert the inner sealing lip into the groove of cylinder.

Note During this operation, the piston has to be supported in front of the brake caliper housing.

  • Fit the wrench open / closed - T10165- on the brake calliper housing piston.
  • In order to turn the piston, use the disc - T10165/1- .
  • Fit the piston to the brake calliper housing by turning the handle on the tool to the right.

Note

  • Insert piston compressing tool (make sure that the collar contacts the brake caliper).
  • If the position of the piston is modified with the open/close wrench - T10165- then the automatic readjustment of the brake calliper will be broken.

 

  • Fit the brake pads.

Pre-bleeding brake caliper:

  • Open the air purge screw -arrow A- and, using the brake fluid collection flask, fill the brake fluid up to a point where fluid without bubbles comes out of the screw hole (connection for the brake hose) -arrow B- .
  • Close bleeder valve.

Note For the initial purge, fit the brake calliper as shown in the illustration.

    Exploded view - rear brake calliper
    Assembly overview - rear brake calliper, vehicles with manual parking brake - Air drain plug, 10 Nm Before tightening, apply a fine layer of assembly paste to the screw thread . ...

    Removing and installing protective cap, vehicles with electronic parking brake
    Special tools and workshop equipment required Lever - 3409- attachment tool - T10502- Thrust piece - T10145- Removing Only the protective cap is intended to be renewed. Note ...

    See also:

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