Review on 🔧 Dorman M39842 Brake Master Cylinder: Your Ultimate Solution for Reliable Braking Performance by Alex Tinker

Looks very good, appears to be an almost exact replacement, very happy with Revain and their Dorman master cylinder - would buy again without hesitation. The master cylinder fits almost exactly. As far as I can remember a month ago the only difference in appearance and design was a minor small difference in how the low fluid electrical connector was fitted into the brake fluid reservoir and my car's electrical connector could be a little tight. Be very careful and careful when installing as both the original and replacement cylinder bodies are made of aluminium. I had a little trouble getting either of the two fittings on display to snag and start screwing into the aluminum master cylinder body. Finally, I detached the replacement master cylinder back from the power brake assembly to move it around a bit, and in the process I also bent the brake line a bit to get a better square match to start flaring. I really suspect the problem was that Toyota didn't perfectly match the curvature of the original lines to the original cylinder. Again, I think this was more due to the Toyota fit and more specifically my concern that the initial threads of the fit should not be twisted. Because of Toyota's original design, it's a bottleneck and it's difficult for your hands to reach it and match the lines or see the fit before you start the flared fit. You need to see and work with a couple of identical cars to really pinpoint the area of the problem. All of this speaks to the fact that I will buy a Dorman product again.