Peugeot 405 Manual

Rear wheel cylinder - removal, overhaul and refitting
Braking system / Rear wheel cylinder - removal, overhaul and refitting


Note: Before starting work, refer to the note at the beginning of Section 2 concerning the dangers of hydraulic fluid, and to the warning at the beginning of Section 4 concerning the dangers of asbestos dust.

Removal
1 Remove the brake drum (see Section 9).

2 Using pliers, carefully unhook the upper brake shoe return spring, and remove it from both brake shoes. Pull the upper ends of the shoes away from the wheel cylinder to disengage them from the pistons.

3 Minimise fluid loss by first removing the master cylinder reservoir cap, and then tightening it down onto a piece of polythene, to obtain an airtight seal. Alternatively, use brake hose clamp, a G-clamp or a similar tool to clamp the flexible hose at the nearest convenient point to the wheel cylinder.

4 Wipe away all traces of dirt around the brake pipe union at the rear of the wheel cylinder, and unscrew the union nut (see illustration). Carefully ease the pipe out of the wheel cylinder, and plug or tape over its end to prevent dirt entry. Wipe off any spilt fluid immediately.

12.4 Brake pipe union (A) and rear wheel cylinder retaining bolts (B)
12.4 Brake pipe union (A) and rear wheel cylinder retaining bolts (B)

5 Unscrew the two wheel cylinder retaining bolts from the rear of the backplate, and remove the cylinder, taking great care not to allow surplus hydraulic fluid to contaminate the brake shoe linings.

Overhaul
Models without underbody-mounted rear brake pressure-regulating valve (see Section 21)
6 It is not possible to overhaul the cylinder, since no components are available separately.

If faulty, the complete wheel cylinder assembly must be renewed.

Models with underbody-mounted rear brake pressure-regulating valve (see Section 21)
7 The wheel cylinder can be overhauled after obtaining the relevant repair kit from Peugeot dealer. Ensure that the correct repair kit is obtained for the wheel cylinder being worked on. Note the locations of all components to ensure correct refitting, and lubricate the new seals using clean brake fluid. Follow the assembly instructions supplied with the repair kit (see illustrations).

12.7a Girling rear wheel cylinder components - models with underbodymounted
12.7a Girling rear wheel cylinder components - models with underbodymounted brake pressure-regulating valve

A Repair kit items

12.7b Bendix rear wheel cylinder components - models with underbodymounted
12.7b Bendix rear wheel cylinder components - models with underbodymounted brake pressure-regulating valve

1 Cylinder
2 Securing bolt
3 Bleed screw
4 Repair kit items

Refitting
8 Ensure that the backplate and wheel cylinder mating surfaces are clean, then spread the brake shoes and manoeuvre the wheel cylinder into position.

9 Engage the brake pipe, and screw in the union nut two or three turns to ensure that the thread has started.

10 Insert the two wheel cylinder retaining bolts, and tighten them securely. Now fully tighten the brake pipe union nut.

11 Remove the clamp from the flexible brake hose, or the polythene from the master cylinder reservoir (as applicable).

12 Ensure that the brake shoes are correctly located in the cylinder pistons, then carefully refit the brake shoe upper return spring, using a screwdriver to stretch the spring into position.

13 Refit the brake drum (see Section 9).

14 Bleed the brake hydraulic system (see Section 2). Providing precautions were taken to minimise loss of fluid, it should only be necessary to bleed the relevant rear brake.


© 2018 www.peugeot405.ru. All Rights Reserved.