Wrong rivets slip linin
Page 93
If you've noticed an error in this article please click here to report it so we can fix it.
• Some 88% of replies to the ADF's survey reported incidents of loose linings. Five hundred . questionnaires were sent out including 280 to reliners: 54 replies were received.
Of those, six reported no problems; 17 had encountered isolated problems across truck, trailers and coaches; and 31 reported repeated problems with 7.5in ROR brakes in the centre of ABS equipped tri-axle trailers.
In most cases it appeared that reliners were using copper rivets. Switching to copper coated steel rivets, as specified by R0-11, cured the problem in all cases.
A smaller number of problems were reported on Volvo coaches. These were traced to the fact that on one brake there is a countersink in the back of the shoe—during riveting a square edged tool can hit the countersink before crimping the rivet. Chamfering the tool restores the correct clamping operation.
Ferodo has published a CV Brake Shoe Inspection Reject Report form.
It includes areas for indicating defects with corners, webb(s), welds, platform distortion and radius. The hole positions are drawn in freehand and either ticked or crossed to indicate pass or fail.
A form is filled out for each rejected shoe; the customer gets one copy and the refiner keeps the other.