🛑 Stop at nothing with precision braking power!
The Dorman M630031 Brake Master Cylinder is a 100% new, precision-engineered replacement part designed to match original equipment specifications for select Cadillac, Chevrolet, and GMC models from 1999-2002. Featuring durable EPDM rubber components resistant to glycol-based brake fluid and manufactured to meet rigorous SAE standards, it guarantees reliable, long-lasting braking performance. Confirm fitment easily with the included garage tool to ensure seamless installation and safety.
| Manufacturer | Dorman Products |
| Brand | Dorman |
| Model | Dorman M630031: Brake Master Cylinder |
| Item Weight | 1.6 ounces |
| Product Dimensions | 12.6 x 7.8 x 5.4 inches |
| Item model number | M630031 |
| Exterior | Machined |
| Manufacturer Part Number | M630031 |
| OEM Part Number | 10-2881; 13-2881; 130.66041; 131.66041; 13570; 174-1003; F131468; F140673; M-86038; M3089; M901215; M901239; MC140673; MC390541; MC500150; MC500320; NM3089; 18040252; 18048538; 18060789; 19209249 |
J**L
GM Master Cylinder works Great!
My truck is 23 years old and the brakes were getting soft. Replace brake pads and rotors and the last item was the master cylinder. After reading how to bleed the master cylinder before installation, I installed it into my truck. took about 20 minutes to installed. Then took the next 90 minutes to bleed all my wheels. Hardest part was getting to the brake cylinders under the truck. Once done, it worked perfectly. Brake are feeling harder and stops as expected. Good product for my Chevy Truck!
D**Y
A easy replacement, no issues, no surprises good value
I was doing brake work on my truck and its 20 yrs old and I was doing calipers and flex lines already, so I figured heck, the master cylinder can't be far behind and its pretty cheap to do, so I ordered this part. Direct replacement and with the bleeding kit (sold separately) I did the "bench bleed" on the truck which for me was easier, however still required two people to see when it was done bubbling.My new brakes are awesome, the pedal is high and hard, no mushy pedal! I'd recommend this part and doing replacement as I did if your vehicle is old and the existing fluid looks crappy and dark. The brake fluid is hydroscopic and adsorbs water from the air, and that is a cause of corrosion to everything in your system - ABS pump, calipers, master cylinder.
A**Z
Good value.
Works great perfect fit. Easy installation. Good value.
G**D
Quality product
Replaced this years ago still working great
C**.
Fit just fine
Used this to replace the master cylinder on my 1994 GMC K1500. Followed many of the website threads and many Youtube videos. Fit just fine and does seem to have shorter pedal travel. Hard to tell though since my rear wheel cylinders were leaking, replaced those also. I like the increased fluid capacity over the original master cylinder.
M**A
That it fits on the truck, but hope it works being used oh I'll have to bench bleed it again.
The product was good but it came messy of fluid all over the box and leaking.
C**
perfect replacement.
great replacement at a good price with no leaks and no problems getting it installed.
J**R
Worked great
Took a lifetime to get it bench bleed but it worked great on my 90 k2500 with the line adapter.
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