Convert hydraulic brake pressure into the outward force that pushes the rear brake shoes against the drum with the Dorman - First Stop Drum Brake Wheel Cylinder W37741. It drops in as a direct-fit rear replacement for the 1977-1982 Porsche 924 [All], where each vehicle uses two (one per rear wheel). Dorman engineered it to match the original cylinder's fit, function, and performance on the vehicles it covers, and each unit is built and tested for quality assurance.
- Cast-iron body: made with high-quality EPDM rubber cups and boots for long-lasting performance.
- Surface-tested bore: the wheel-cylinder bore is surface-tested to provide an optimal sealing surface for the pressure cups.
- Spec: 0.75 in inside diameter with an M10 x 1.0 inlet thread (10 mm thread diameter, 1.0 pitch).
- Bleeder hardware: a bleeder screw is included; the bleeder screw cap is not included.
Replacing the wheel cylinder while servicing the drum brakes is a fast, cost-effective way to help maintain proper rear braking. Sold individually; the listed application uses two, so order two for a complete rear replacement. Country of origin: Italy.
Interchange: 18E283 · 84-82200 · 8482200 · W906606 · W-15200 · W15200 · 072-7776 · 0727776 · 34180 · 134.37200 · WC255310 · 375-02003 · 471611055E · WC37741 · 471611055B · F116685 · WC116685 · Manufacturer part number W37741.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Which vehicle does this wheel cylinder fit?
It's a direct-fit rear drum brake wheel cylinder for the 1977-1982 Porsche 924 [All]. Check the Buyer's Guide tab to confirm the fit for your vehicle.
How many do I need?
The listed application uses two (one per rear wheel). This listing is sold individually, so order two for a complete rear-axle replacement.
What are the bore and thread specs?
It has a 0.75 in inside diameter (bore) and an M10 x 1.0 inlet thread, with a 10 mm thread diameter and 1.0 thread pitch.
Is a bleeder screw included?
Yes, a bleeder screw is included. The bleeder screw cap is not included.
What are signs this wheel cylinder may need replacing?
Possible signs include brake fluid leaking at the backing plate or drum, a soft or sinking brake pedal, and weak rear braking. Diagnose the cause before replacing, as other parts can produce these symptoms.
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