Clean those smelly shoes!
It’s always worth checking brake shoes that apparently appear to be in good, reusable, condition. Sometimes there’s absolutely nothing wrong with them and they can happily be pressed back into service after a clean… but not always. A phenomenon known as ‘intergranular corrosion’ can render old bonded brake shoes useless at best and potential killers at worse. The cast alloy of your brake shoes is generally resistant to corrosion but, under the wrong conditions, can seriously degrade. Moisture ingress to the brake drum can cause the alloy surface, to which the friction material is bonded, to grow a white crystalline coat that rapidly repels the adhesive and the shoe. If you can get a flat screwdriver blade under any end of a set of shoes they are scrap. In use if a portion breaks off and jumps above the rest of the friction material you’ll be on your ear and spinning across the Tarmac. Please don’t take brake linings for granted!