Rebuilding brakes.

7 August 2008

Front brakes
The backing plate (the flattened edge and the self-adjuster screw slot point towards the rear, so this plate is for the right-hand side), assorted hardware and the self-adjuster screw (thick grooves for the front, thin for the back).

The brake cylinder installed, the bolts holes only align one way with the holes on the backing plates, so it’s not possible to install a right-hand cylinder on a left-hand backing plate. The plungers pushed into the ends of the cylinder.

The brake shoes, the backing plate greased, and the shoe positioned on the backing plate. The pair of shoes consist of one long and one short. The longer shoe points to the rear, the shorter one to the front.

The self adjuster hardware:

Self adjuster bracket on the shoe, and the hold-down spring for this shoe.

For this shoe (with the self adjuster) a number 4 pin has to be used. With one hand holding the pin in place (through the back of the plate, through the shoe and the self adjuster and into the spring) use a pair of pliers to push down on the top of the spring and rotate to hold the pin in place.

The front shoe put in place and its hold-down spring. This side has a washer underneath the spring.

This little bracket plate gets put on just above the hydraulic cylinder. Then a solid bar ties this plate to the self adjuster bracket. Now is a good time to put the spring on the bottom of the self adjuster.

These two green springs are identical (no left or right). They hook onto the brake shoes and stretch to the bracket plate up top.

Now for the spring holding the bottoms of the shoes together (note that it is wrong in these pictures… instead of the rear-shoe-side of the spring being hooked from underneath, it should be hooked from the top – this is so the self-adjuster screw can actually fit). Then the self adjuster screw can be put in (better to do this before the spring), be careful of the orientation of threads on the self adjuster (right or left hand threaded). Lastly, the spring on the self adjuster bracket can be installed.


Rear brakes
The brake hardware. There is more hardware than for the front due to the parking brake assembly. Note the thin grooves for the rear self-adjuster screws.

The rear backing plate (the adjuster slot at the bottom “points” to the rear, so this is the right-side) greased. The parking cable. And the parking cable and brake cylinder installed.

The parking brake lever installed on the cable. To make it all fit the parking cable has to be pulled tight and held that way (grips on the end work). This lever fits underneath the rear shoe.

Fitting the hold down springs and pins…

More parking brake mechanisms. Note the alignment of the rear shoe and the parking brake lever underneath it. It’s also clear to see where the cylinder plungers go. The parking brake bar is pronged on either end – the wide prongs go to the shoe with the parking brake lever. The protruding section of the middle bar should stick out from the brake. The spring on the bar is oval – this should go on the shoe without the parking brake.

A bendy bar and more springs…

The self adjuster screw installed, and the last spring (self adjuster bracket):


…Fully rebuilt!

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