Re: [MV] M211 brake seizure

Andreas Mehlhorn (a.mehlhorn@t-online.de)
Tue, 5 May 1998 23:05:24 +0200

MVTrucker schrieb:
>=20
> How did the brakes build up like that? Is it in
> the hydro-vac system? He did not apply the brakes or pump the pedal,
> the brakes just came on as he drove along.
>
Pressure in the brake hydraulic system can only build up, when the
little feeder hole from the master cylinder to the brake fluid
reservoir is clogged.
This can be because of the hole itself is clogged, or the master cylinder
piston doesn't go back enough. The piston opens the little feeder hole
only when it is in the completely back position. If you use a wrong brake
pedal or push rod, which doesn't allow the piston to go back completely,
the feeder hole doesn't open and the fluid from the system can't flow
back to the reservoir.=20

If now the brake shoes touch the drums a little bit, the friction makes
heat and the heat makes more pressure in the system. More pressure pushes
the shoes stronger to the drums =3D more friction =3D more heat , so long
until the brakes are hot and seized.

This happens often on modern motorbikes, when the bikers use aftermarket
hand brake levers, which are a little bit different in size. The feeder
hole closed, friction makes heat, heat makes pressure and in a short=20
while your motorbikes front wheel brake seizes.

So have a look on your brake system. If you press brake fluid with a=20
little pump or a power bleeder through the bleeder valves of the wheel
cylinders into the system, does it flow through the system and fill the
reservoir?
If not, check why the flow of the fluid is blocked.

Needless to say, that this is a dangerous state, when the brake engages
without your will.

Regards
Andreas

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