JP Group Brake Master Cylinder, 23.8 mm (15/16 in) Tandem | Audi 100 1989–1990 | OE 443 611 021 (JP-3164-0)
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JP Group Brake Master Cylinder, 23.8 mm — Audi 100 1989–1990, OE 443 611 021 (JP-3164-0)
Short answer: JP Group JP-3164-0 is a new tandem (dual-circuit) brake master cylinder with a 23.8 mm (15/16 in) bore. It replaces OE 443 611 021 (JP ref 1161100200) and is listed by EMPI for the 1989–1990 Audi 100. It bolts to the brake booster and feeds both brake circuits. Sold each, with no core charge.
Fitment
| Years | Vehicle | Notes |
|---|---|---|
| 1989–1990 | Audi 100 (C3) | EMPI fitment |
| Other years | Audi 100 / 200 / 5000 (C3) and related models using 443 611 021 | European catalogs list the same OE number on more C3-platform cars. Not confirmed by EMPI. Compare bore size, port layout and reservoir. |
| 1980–1991 | VW Vanagon | Not this part. The Vanagon 23.8 mm master cylinder is OE 251 611 021 C. |
| Any | Cars with ABS-specific master cylinders | Confirm first. Some ABS cars use a different unit. |
Specifications
| Spec | Value |
|---|---|
| Part number | JP Group JP-3164-0 |
| OE reference | 443 611 021 |
| JP Group reference | 1161100200 |
| UPC | 707924541465 |
| Bore | 23.8 mm (15/16 in) |
| Type | Tandem, dual circuit |
| Condition | New, no core |
| Sold as | Each |
| Shipping weight | 1.2 lb (EMPI) |
| Package | 9 x 4 x 3 in (EMPI) |
What's Included
- One brake master cylinder
Not Included
- Fluid reservoir and reservoir grommets (reuse yours or buy new)
- Booster seal / O-ring and mounting nuts
- Brake fluid
- Brake lines
Why It Matters
The master cylinder turns pedal pressure into hydraulic pressure for all four brakes. As the internal seals wear, fluid gets past the pistons. You may notice the pedal slowly sinking toward the floor while you hold it at a stop, a soft or spongy pedal that firms up with pumping, the brake warning light coming on, fluid on the booster or below the master cylinder, or longer stopping distances. A leaking master cylinder can also strip the paint from the booster. Because this part affects every brake on the car, a failing master cylinder should be replaced right away.
Installation Notes
- Bench-bleed the new master cylinder before you install it. This makes the bleed on the car much faster.
- Use flare-nut wrenches on the brake lines to avoid rounding the fittings, and cap the lines to keep dirt out.
- Fit new reservoir grommets, and a new booster seal if your car uses one.
- Bleed all four corners with fresh DOT 4 fluid, starting with the wheel farthest from the master cylinder.
- Check pedal height and feel and the warning light before you drive. Use the factory manual for nut torque.
Frequently Asked Questions
Does it fit my 1990 Audi 100?
Yes. EMPI lists the 1989–1990 Audi 100.
Is this the same as OE 443 611 021?
Yes. JP Group cross-references JP-3164-0 to 443 611 021.
Does it fit an Audi 200 or 5000?
Some versions use the same OE number, but EMPI has not confirmed it. Compare your old part.
Does it fit a VW Vanagon?
No. The Vanagon unit is 251 611 021 C.
Is it new or rebuilt?
New. There is no core to return.
What else do I need?
DOT 4 brake fluid, reservoir grommets and a bench-bleed kit.
Does it come with the reservoir?
No. It is the cylinder only.
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