General information (Peugeot 106)

The braking system is of the servoassisted, dual-circuit hydraulic type. The arrangement of the hydraulic system is such that each circuit operates one front and one rear brake from a tandem master cylinder. Under normal circumstances, both circuits operate in unison. However, in the event of hydraulic failure in one circuit, full braking force will still be available at two diagonally-opposite wheels (see illustration).



Some large-capacity engine models have disc brakes all round as standard; all other models are fitted with front disc brakes and rear drum brakes. An anti-lock braking system (ABS) is available as an option on certain models (refer to Section 23 for further information on ABS operation).

The front disc brakes are actuated by single-piston sliding type calipers, which ensure that equal pressure is applied to each disc pad (see illustration).





The rear drum brakes incorporate leading and trailing shoes, which are actuated by twinpiston wheel cylinders (see illustration). On models without ABS, the wheel cylinders incorporate integral pressure-regulating valves, which control the hydraulic pressure applied to the rear brakes. The regulating valves help to prevent rear wheel lock-up during emergency braking. On models with ABS, a load-sensitive rear pressure-regulating valve is fitted. A selfadjust mechanism is incorporated, to automatically compensate for brake shoe wear. As the brake shoe linings wear, the footbrake operation automatically operates the adjuster mechanism, which effectively lengthens the shoe strut and repositions the brake shoes, to remove the lining-to-drum clearance.

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On models with rear disc brakes, the brakes are actuated by single-piston sliding calipers which incorporate mechanical handbrake mechanisms. A pressureregulating valve is situated in the brake line to each rear caliper. The regulating valve is similar to that fitted to the rear wheel cylinders on drum brake models, and helps to prevent rear wheel lock-up during emergency braking. On models with ABS, a load-sensitive rear pressure-regulating valve is fitted, linked to the rear axle.



On all models, the handbrake provides an independent mechanical means of rear brake application.

On diesel models, there is insufficient vacuum in the inlet manifold to operate the braking system servo effectively. To overcome this problem, a vacuum pump is fitted to the engine, to provide vacuum to the servo unit. The vacuum pump is mounted on the end of the cylinder head and is driven directly from the camshaft.

Note: When servicing any part of the system, work carefully and methodically; also observe scrupulous cleanliness when overhauling any part of the hydraulic system. Always renew components (tn axle sets, where applicable) if in doubt about their condition and use only genuine Peugeot replacement parts, or at least those of known good quality. Note the warnings given in "Safety first" and at relevant points in this Chapter concerning the dangers of asbestos dust and hydraulic fluid.