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A rear caliper with an integrated handbrake mechanism has a piston that screws back rather than pushing. Forcing it with a spreader damages the mechanism, so a wind-back tool turns the piston while pressing it, which is the only way it retracts properly.
The pin pattern on the piston face is what the adaptor has to match. Pistons carry two pins, slots or a recess depending on the manufacturer, and an adaptor that does not seat properly will slip and mark the piston face. This is why kits carry many adaptors rather than one universal fitting. Sealey run the VS ladder across those patterns with Draper cubes covering the simpler pistons.
Thread hand is the second catch. Most pistons wind in clockwise, but some are left-hand threaded, and turning the wrong way tightens rather than retracts. Adaptors for both hands are held, along with double adaptors that cover two patterns on one piece. A pneumatic spreader, wind back and hose clip tool combines three of those jobs in one body.
Kit size follows how many vehicles the bay meets. A 4 or 5 piece kit covers the common patterns; 21, 29, 30 and 50 piece kits cover a workshop taking whatever arrives. An adjustable 2-pin adaptor on 3/8 inch drive spans a range of pin spacings, and air operated forms remove the effort. A photo of the piston face sent to 07754288583 on WhatsApp identifies the pin pattern without stripping the caliper first.
| Product Dimenstions (L x W x H) | 390 x 60 x 40 mm |
|---|---|
| Product Weight | 0.15 Kg |
| Product Dimenstions (L x W x H) | 460 x 380 x 95 mm |
|---|---|
| Product Weight | 3.45 Kg |
| Size | 4.75mm | 3/16" |
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