24-11-2020, 08:27 PM
Hi Denis
With plunger activated "Full Girling" brakes, the brake actuator is allowed to slide slightly in the backplate, to equalise the pressure on the two shoes. This is achieved by using slightly slotted holes, plus thackeray washers and castellated brass nuts which are only done up tight enough to give a sliding fit. Tiny split pins stop the nuts coming undone.
Austin kept cams for actuation in their "Semi Girling" interpretation, so in this case the actuator has to be held rigid. However, the castellated nuts etc were kept, maybe in the interests of standardisation by the supplier ?
I suspect that ordinary nuts plus shakeproof washers and/or loctite would therefore suffice.
With plunger activated "Full Girling" brakes, the brake actuator is allowed to slide slightly in the backplate, to equalise the pressure on the two shoes. This is achieved by using slightly slotted holes, plus thackeray washers and castellated brass nuts which are only done up tight enough to give a sliding fit. Tiny split pins stop the nuts coming undone.
Austin kept cams for actuation in their "Semi Girling" interpretation, so in this case the actuator has to be held rigid. However, the castellated nuts etc were kept, maybe in the interests of standardisation by the supplier ?
I suspect that ordinary nuts plus shakeproof washers and/or loctite would therefore suffice.