- Fri Jan 25, 2019 6:55 pm
#81243
In which case one of two situations exist: The two holes in the brake plate that the cams pivot in are not on the same Pitch Circle Diameter? Check the PCD with a dummy axle secured into the brake plate...
OR
One or the other of the two cams are not machined identically?
Variation in brake-cam PCD of up to 0.5mm is not uncommon, and for other than racing service one can typically live with it. Over 0.5mm variation of PCD and either a new brake plate is in order' (check it; 'new' does not mean that it is true and correct...) otherwise BOTH cam pivot holes need rebushing so that they lie on the the same PCD. Raidialy AND Axially.
Why is 0.5mm 'wiggle room' acceptable for street use? There is always at least that amount of 'slop' (lost movement) at the trunions which is usually able to be successfully accommodated via the fine adjustment of the LH/RH link rod.
Tim NZ
OR
One or the other of the two cams are not machined identically?
Variation in brake-cam PCD of up to 0.5mm is not uncommon, and for other than racing service one can typically live with it. Over 0.5mm variation of PCD and either a new brake plate is in order' (check it; 'new' does not mean that it is true and correct...) otherwise BOTH cam pivot holes need rebushing so that they lie on the the same PCD. Raidialy AND Axially.
Why is 0.5mm 'wiggle room' acceptable for street use? There is always at least that amount of 'slop' (lost movement) at the trunions which is usually able to be successfully accommodated via the fine adjustment of the LH/RH link rod.
Tim NZ