| DESCRIPTION
The rear brakes incorporate leading and trailing brake shoes operated by a single freely mounted wheel cylinder. Adjustment for lining wear is effected by a mechanical adjuster situated diametrically opposite the wheel cylinder at the top of the brake back plate.
The two brake shoes are supported by platforms pressed in the backing plate and spring loaded steady posts keep them at right angles to the brake drum.
As hydraulic pressure is applied, the wheel cylinder piston moves the leading brake shoe outwards to the brake drum. As the leading brake shoe meets the drum, further movement of the piston causes the wheel cylinder body to slide in the back plate and moves the trailing shoe outwards to the brake drum.
When the hydraulic pressure is released the pull off springs return the brake shoes and wheel cylinder piston" to their original position and the rotating brake drum centralises the brake shoes and wheel cylinder in the brake back plate.
BRAKE SHOES
Two brake shoes, known as leading and trailing, are fitted to each brake back plate and they are steadied by a spring loaded steady post each.
The leading brake shoe, nearest the rear of the car, is operated by the piston of the wheel cylinder or hand- brake lever while the trailing brake shoe, nearest the front of the car, is operated by the reaction of the wheel cylinder body as it slides in the back plate slot.
Always fit factory-lined replacement brake shoes and new pull off springs. These brake shoes have the correct type of lining which is ground accurately to size, thus ensuring an easy and quick bed-in to the brake drum.
To remove and refit (Fig. 3)
1. Chock the front wheels, release the handbrake, jack up the rear of the car and remove the rear wheel.
2. Remove the brake drum from the hub by slackening off the brake adjuster and withdrawing a counter sunk screw.
3. Remove the leaf springs and steady posts from the
brake shoes and back plate by holding the head of the steady post while compressing the leaf spring and sliding it sideways.
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4. Identify the ends of the two pull off springs to the holes in the brake shoe webs and remove the heel end of the leading (rearmost) brake shoe from the slot in the brake adjuster link and remove the toe end from the handbrake lever in the wheel cylinder just above the piston.
5. The tension of the pull off springs is now released and trailing (foremost) brake shoes can now be removed from the slots in the brake adjuster link and wheel cylinder body.
6. Apply rubber bands to the wheel cylinder and brake adjuster to retain the piston@and adjuster links within the wheel cylinder and brake adjuster.
7. Refitting is the reverse of the removal sequence but particular attention must be given ;o the following:-
(i) Lightly smear the slots in the wheel cylinder and adjuster links with "Girling White Brake Grease ".
(ii) When fitting new brake shoes also fit new pull off springs, fit the springs according to the identification markings. Both pull off springs are fitted between the brake shoe web and the back plate; the single coiled spring adjacent to the adjuster and the longer coil of the double coiled spring hooked on to the web of the trailing (foremost) brake shoe.
(iii) Adjust the rear brakes, see under "Rear brake adjustment" but when new brake shoes have been fitted, slacken off the adjuster one more click to allow for lining expansion and revert to normal adjustment after a short mileage.
BRAKE ADJUSTER
The brake adjuster consists of two sliding links and a threaded steel wedge housed in a body which is attached rigidly to the brake back plate. The outer end of the two links is slotted the heel ends of the brake shoe webs. end of the two links are inclined to mate flats on the conical head of the steel wedge, which is set at right angles to the links.
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