Peugeot 405 Manual

Rear brake drum - removal, inspection and refitting
Braking system / Rear brake drum - removal, inspection and refitting


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

Removal
1 Chock the front wheels, then jack up the rear of the vehicle and support it on axle stands (see УJacking and Vehicle SupportФ).

Remove the appropriate rear roadwheel.

2 Remove the drum retaining screw (see illustration).

9.2 Rear brake drum retaining screw (arrowed)
9.2 Rear brake drum retaining screw (arrowed)

3 It should now be possible to withdraw the brake drum by hand. It may be difficult to remove the drum due to the brake shoes binding on the inner circumference of the drum. If the brake shoes are binding, proceed as follows.

a) First check that the handbrake is fully released, then referring to Section 17 for further information, fully slacken the handbrake cable adjuster nut, to obtain maximum free play in the cable.

b) Insert a screwdriver through the access hole in the rear of the backplate (prise out the blanking plug, where applicable), so that it contacts the handbrake operating lever on the trailing brake shoe. Push the lever until the stop-peg slips behind the brake shoe web, allowing the brake shoes to retract fully (see illustrations). The brake drum can now be withdrawn.

9.3a Using a screwdriver inserted through the brake drum to release the
9.3a Using a screwdriver inserted through the brake drum to release the handbrake operating lever

E Handbrake operating lever stop-peg location

9.3b Releasing the handbrake operating lever
9.3b Releasing the handbrake operating lever

Inspection
Note: If either drum requires renewal, BOTH should be renewed at the same time, to ensure even and consistent braking. New brake shoes should also be fitted.

4 Working carefully, remove all traces of brake dust from the drum, but avoid inhaling the dust, as it is injurious to health.

5 Clean the outside of the drum, and check it for obvious signs of wear or damage, such as cracks around the roadwheel bolt holes; renew the drum if necessary.

6 Examine carefully the inside of the drum.

Light scoring of the friction surface is normal, but if heavy scoring is found, the drum must be renewed. It is usual to find a lip on the drumТs inboard edge which consists of a mixture of rust and brake dust; this should be scraped away, to leave a smooth surface which can be polished with fine (120- to 150- grade) emery paper. If, however, the lip is due to the friction surface being recessed by excessive wear, then the drum must be renewed.

7 If the drum is thought to be excessively worn, or oval, its internal diameter must be measured at several points using an internal micrometer. Take measurements in pairs, the second at right-angles to the first, and compare the two, to check for signs of ovality.

Provided that it does not enlarge the drum to beyond the specified maximum diameter, it may be possible to have the drum refinished by skimming or grinding; if this is not possible, the drums on both sides must be renewed.

Note that if the drum is to be skimmed, BOTH drums must be refinished, to maintain a consistent internal diameter on both sides.

Refitting
8 If a new brake drum is to be installed, use a suitable solvent to remove any preservative coating that may have been applied to its interior. Note that it may also be necessary to shorten the adjuster strut length, by rotating the strut wheel, to allow the drum to pass over the brake shoes.

9 Ensure that the handbrake lever stop-peg is correctly repositioned against the edge of the brake shoe web (see illustration), and ensure that the mating faces of the hub and brake drum are clean, then slide the brake drum onto the hub.

9.9 Check that the handbrake lever stoppeg (arrowed) is against the shoe edge
9.9 Check that the handbrake lever stoppeg (arrowed) is against the shoe edge

10 Refit and tighten the drum retaining screw.

11 Depress the footbrake several times to operate the self-adjusting mechanism.

12 Repeat the above procedure on the remaining rear brake assembly (where necessary), then check and, if necessary, adjust the handbrake cable as described in Section 17.

13 On completion, refit the roadwheel(s), then lower the vehicle to the ground and tighten the wheel bolts to the specified torque.


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