MC-54-250B rear brake hard to squeeze, "ABS" notic By technoglide (Read 897 times)

[technoglide]

Howdy Pardners,

Another curious effect here at Atlanta's "Area 52". I have refurbed this scoot. if interested in all other stuff, search "technoglide'. Otherwise, here's the matter at hand, recently surfaced upon extensive riding:

Both brakes worked well with even pull and even stopping force. After ~70 miles varied driving, the rear brake became hard to squeeze and had less "stopping power". Also, at the end of the stop, I can feel what seems like what a crude and/or broken ABS system might feel like it. stop-go-stop-go-stop-go-stop, etc. Front brake seems fine.

I also notice there are grease nipples on the brake assemblies. I assume they need some lube and PM from time to time. Whaddya guys think?

Andy

[Cruiser]

Hi Andy. Those fittings on the brakes that look like grease fittings are bleeder screws. They are used to purge the brake system of any air when bleeding the brakes. Do not attempt to inject anything into these fittings. The pulsing from the rear brake could be a warped rotor or glazing on the rotor which would cause uneven friction. You might be able to see any problems by putting the scoot on the center stand and checking the rotor while spinning the wheel.

[technoglide]

Whew! Glad I asked about those "grease nipples". The rotor appears OK. I can live with the on-off-on-off at the end of a controlled stop for a few days. What I'm really curious about is: what makes a brake lever lose it's play and require more squeeze force to effect the same stop? Do these brakes use a slave cylinder type of action? The brake fluid appears the same in each window.

[Cruiser]

Reduced brake lever movement could be caused by a frozen piston or pistons inside the brake caliper. Could also be caused by the caliper binding on the mounting pins. The caliper is supposed to float so that it can adjust to the wearing brake pads and also to allow the release of brake pressure when you are not using the brakes. The pads normally rub lightly on the rotor even when not using the brakes.

[technoglide]

Thanks! lemme check that out and I'll post the findings. Preshadit!