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Michael J Langley
Jul 1, 2017 - 10:41PM
Brake Drum Standards & Correct Brake Shoe Rollers Sizes

The following information applies to all RM codes as per LT chart No 0316 dated 01/09/1989

Front & Rear Brake drum internal diameter measurements are the same when new.

Only sufficient metal is to be removed to obtain a smooth parallel finish to conform to the following data.

Front Brake Drum LT Pt No L20036
Rear Brake Drum LT Pt No F1/15617

1) All new drums start at a measurement of 393.7mm & can be machined out to 396.5mm max

Roller size to suit will be (1st standard only) @ 1.5 inches dia LT Pt No F10901

2) Drums from 396.5mm & can be machined out to 400.5mm max

Roller size to suit will be (2nd standard only) @ 1.75 inches dia LT Pt No F10903

3) Drums from 400.5mm & can be machined out to 403mm max

Roller size to suit will be (3rd standard only) @ 2 inches dia LT Pt No F10902

My bus number (if any): Ex LTE Bus Engineering

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Jul 1st, 2017 - 10:41 PM
r
roythebus
Jul 3, 2017 - 7:41AM
Re: Brake Drum Standards & Correct Brake Shoe Rollers Sizes

Useful info there, and a mix of imperial and metric measurements!

How many times I've seen oversize drums and standard rollers I can't remember, and people wonder why their buses don't stop! I've even seen buses with different size rollers on the same drum...

My bus number (if any): RML2532

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Jul 3rd, 2017 - 7:41 AM
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