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Porsche // Panamera 971 MK1 (2017-2020) // 971.1 Panamera Turbo V8 4.0L 4WD Executive 2017-20
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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 356C 1963-65
Keep your classic Porsche braking at its best with this Genuine Porsche Rear Brake Expander Spring. This small but essential component sits inside the rear disc brake assembly on early Porsche 911, 912 and some 914 models equipped with solid (non-ventilated) rear discs.
Fits:
Porsche 912 1969
Porsche 911 T 1969
Diagram ref no 17
The expander spring, also known as a tension or retaining spring, is a precision-engineered piece of brake hardware designed to maintain correct pad alignment and eliminate unwanted movement in the caliper assembly. Although minor in appearance, it plays a major role in ensuring the brake pads sit securely and function smoothly.
This spring helps to:
• Keep the brake pads correctly positioned inside the rear caliper
• Maintain proper tension in the brake assembly
• Reduce vibration and brake noise (rattle/chatter)
• Support even brake pad wear
• Promote consistent braking performance.
If this spring weakens, wears out, or breaks, the pads can shift or rattle, leading to noise, uneven wear, and reduced braking precision.
Over decades of use, heat cycles, corrosion, and general wear cause these springs to lose tension. Common signs that it’s time to replace include:
• Rattling or clicking noises from the rear brakes
• Uneven brake pad wear
• Pads that don’t retract smoothly
• Caliper movement or vibration
• During a brake rebuild or classic restoration
Because this is a classic-model component, many cars still on the road are using original hardware that is long overdue for renewal.
Replace the expander spring:
• Whenever fitting new rear pads
• During any brake system overhaul If you notice noise, pad movement, or irregular wear
• As part of routine maintenance on classic Porsche models, especially those with solid rear brake discs
• Whenever the caliper has been disassembled If the spring shows any signs of corrosion, fatigue, or deformation
For best results, always replace springs in pairs per caliper, as specified by Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90135191617
The product you are viewing cross references to these numbers
For brake systems and is highly temperature-resistant (up to 1,000°C).
Available in 75ml tube and 5ml sachet
The advantages of Cera Tec:
• Non-conductive and contains no solids
• Suitable for ABS
• Facilitates brake installation
• Reduces brake squealing
• Protects against scoring and corrosion
• Free of copper and acids
• Pressure-resistant / high viscosity
Cera Tec is also suitable for lubricating:• Disc- and drum-brake systems
• Compressors
• Centralised lubrication systems
• Axle bearings
• Chains
• Seat rails
• Sunroof tracks
• Battery terminals
Application:
Apply a thin layer of Cera Tec on the marked sections
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