Fixed calliper Genuine Porsche part 91135242500

Brake caliper REAR. 
These are direct replacement calipers for the rear left (part number 91135242500) or rear right (part number 91135242600) side of a mid-1980s Porsche 911. They are manufactured to the dimensions, fitment, and technical specifications of the original. Replacing these calipers restores the correct brake pressure, pad alignment, and brake disc-to-rear wheel contact, restoring braking balance and safety.


Porsche 911 1984 - 1989

Brake calipers are crucial for safe, controlled stopping. Over time, calipers can suffer from corrosion, seized or sticking pistons, worn seals, fluid leakage or uneven pad wear. Especially on aging cars, the rear calipers may lose proper clamping force, causing longer stopping distances, uneven braking, noise or poor pad life.

Replace these calipers when you notice:
• Brake fluid leakage around the caliper body or piston area
• Uneven or rapid pad wear on the rear wheel
• Reduced braking performance, dragging wheel or vibration
• Maintenance/restore of the braking system during a rebuild

Installing a correct-fit caliper restores proper braking clamp, pad and rotor alignment and ensures your classic Porsche retains its intended braking performance and safety.

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91135242

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Brake Caliper REAR




Porsche 911 1984-89

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91135242

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Replacement brake caliper piston
SIZE 42mm diameter x 30mm height



Please check your caliper pistons size before ordering, this list below is just a guide

Porsche 911 1984-89 REAR

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91135242X00

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Brake caliper REAR.





Porsche 911 3.2 Carrera - 1984-89

PLEASE NOTE:

• The surcharge for this reconditioned part will be refunded when the exchange unit is received and approved by us and the relevant manufacturer. 
• Please note, surcharge refunds often take an average of 6 to 8 weeks to be approved by the manufacturer. 
• Acceptance of the exchange part is at the manufacturer's discretion, based on the part being fit for reconditioning. 
• All surcharges and exchanges are subject to our terms and conditions. 

Related reference numbers
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91135242

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930-ERX Rear brake calipers.
1 pair, req'd per car.

We've re-engineered a 930 style caliper with specific enhancements for direct fitment to the 911. Our 930-ERX calipers are an updated version of the venerable 930 brakes which have long been the benchmark for performance.



Fits:
Porsche 911 / 912 1969-89
W/ 3" Caliper Bolt Spacing


The 930 Brake Upgrade

930 brakes have been an awesome upgrade for 911 cars in terms of thermal capacity and pedal feel. The four piston calipers and massive 32mm front / 28mm rear rotors give incredible stopping power.

In addition to excellent stopping power, they have a period correct retro race look, retain the parking brake functionality, and even fit under many 15 inch wheels. This is why 930 brakes have traditionally been the sought-after upgrade for 911 racecars, and high end/high powered street car builds.

However fitting them has traditionally been difficult – requiring custom machining (due to differences in 930/911 caliper bolt spacing), wheel clearance issues, and limited availability.

Our re-engineered 930-ERX type calipers keep everything that's great while fixing all the issues. And they accept readily-available 930 type pads, rotors, and master cylinders.

930-ERX Enhancements over Original 930 Calipers

✓ No caliper machining is required for 911 trailing arm fitment.

✓ Our rear calipers have the correct 3.0 inch bolt spacing and radial position to mount directly onto '69-'89 911/912 trailing arms.

✓ The front and rear caliper cooling fins are low profile such that they do not interfere with Fuchs wheel spokes without the need for wheel spacers.

✓ A modern staggered piston design is used for even pad wear on our 930-ERX calipers. Original 930 calipers used same size pistons, which caused pads to wear in a taper.



930-ERX Fitment and Compatibility

The front calipers have 3.5 inch bolt spacing and bolt directly to front struts as equipped on 911 and 912 cars from '72-'89 and 911 S models prior to '72. Early front struts that have 3.0 caliper bolt spacing can convert to 3.5 inch struts, contact us for details.

The rear calipers have 3.0 bolt spacing for direct fitment to 911 and 912 trailing arms from '69-'89 including aluminium and steel trailing arms.

Front and rear calipers accept standard 930 brake pads and standard 911 brake hoses.

Rear calipers use standard type 930 rotors part 930-352-046-01

Front calipers fit with regular 911 hubs and use early type 930 floating rotors with our hat kit #2190005 (floating) or #2190010 (fixed), or late 930 hubs with late 930 fixed rotors.

Use standard 930 master cylinder on '77-'89 911 cars equipped with brake booster, or our master cylinder kit #2190011 for pre-77 cars with non-boosted brakes.

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G-2190007

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Brake caliper, REAR

Porsche 911 1984-89 3.2L

Reconditioned calipers are sold on an exchange basis, A surcharge of £45.00 will be held and then refunded when the old one is returned.

PLEASE NOTE:

• The surcharge for this reconditioned part will be refunded when the exchange unit is received and approved by us and the relevant manufacturer.
• Please note, surcharge refunds often take an average of 6 to 8 weeks to be approved by the manufacturer.
• Acceptance of the exchange part is at the manufacturer's discretion, based on the part being fit for reconditioning.
• All surcharges and exchanges are subject to our terms and conditions.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91135242

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Wilwood rear brake caliper and rotor kit - Dynapro-P radial mount calipers with Brake Pads. 

Upgrade your Porsche 911 (1984–1989) with the Wilwood Narrow Dynapro-P Radial Rear Brake Kit. Featuring forged 4-piston calipers, BP-10 pads, and stainless flexlines, it delivers lightweight strength, modern braking response, and fade resistance.
For brake caliper mounting bolt spacing of 3.0 inches (76.2mm)

Min Wheel Diameter Required: 15 inch
Caliper Mounting Bolt Spacing: 3.0 inch (76.2mm)
Mount Type: Radial
Caliper Type: 4 piston - Powder Coated

Fits:
Porsche 911 3.2 Carrera - 1984 to 1989

Narrow Dynapro-P Radial Rear Brake Caliper Kit

Forged Narrow Dynapro Radial caliper, pad, rotor and bracket kits are engineered as high performance street and race for 1969-1983 Porsche 911's with 3.00" (76.2mm) caliper mounts. These kits combine the high-tech styling and superior performance of the NDPR-P calipers and the positive response, long wear, high fade resistance, and easy clean properties of the BP-10 compound Smart Pads. Kits include plain face or SRP drilled one piece rotors made from proprietary alloys. These kits bolt directly to the front strut without the need for additional brackets or adapters. Braided stainless flexlines are included.

Wilwood Narrow DynaPro four piston radial mount calipers combine the versatility of radial mounting with a sleek profile, superior strength and extreme durability in adverse conditions. With an overall weight as light as 3.58 pounds, the DynaPro has become a favored choice for a broad range of sports, rally, and off-road driving applications.

Kit Features:

• Compatible with factory master cylinder

Brake Pads: BP-10

• BP-10 street performance pads 

Installation Parts:

• Caliper brackets, stainless steel Flexlines and all premium-grade hardware for installation are included

Why Upgrade to the Dynapro-P Radial Kit?

• Motorsport Engineering: Forged calipers developed with FEA for strength and precision.
• Lighter Weight: Calipers weigh just 3.58 lbs each for reduced unsprung mass.
  
• Durability: Stainless steel pistons resist corrosion and heat transfer.
• Direct Fit: Bolts to OE mounts without modification.
• Complete Kit: Includes calipers, pads, brackets, flexlines, and hardware.
  
• Style Options: Calipers available in gloss black, red, or Le Mans yellow powder coat.

Ideal For: Porsche 911 (1984–1989) owners who want modern motorsport-grade braking while retaining OE hubs and factory balance.
Fits: Porsche 911 (1984–1989) with 3.0” caliper mounts
Minimum Wheel Size: 15 inches

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140-16678

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