Dorman M630748 brake master cylinder for the 2008-2014 Lexus IS F and other vehicles turns pedal force into hydraulic pressure for the brakes. This Dorman brake master cylinder is engineered to follow the design and performance of the original unit on the vehicles it fits.
- Part of the Dorman First Stop line
- Aluminum body made entirely of new materials
- EPDM rubber components that resist glycol-based brake fluid
- Two outlets, both threaded M10 x 1.0
- Made to meet SAE International standards
Quick facts
- Part: Dorman M630748 brake master cylinder
- Fits: 2008-2014 Lexus IS F and other vehicles
- Material: Aluminum
- Condition: New
A brake pedal that sinks or feels soft, fluid leaking around the cylinder, or a brake warning light can mean the master cylinder is wearing out. Before you replace it, rule out a leaking line or caliper and worn pads, since either can give a soft pedal too.
Fits
The vehicles it fits include the 2008-2014 Lexus IS F, the 2006-2013 Lexus IS250 and the 2006-2013 Lexus IS350, and each takes one.
Specifications
Fit and size
- Bore diameter: 0.875 in
- Number of outlets: 2
- Rearward outlet size: M10 x 1.0
- Secondary outlet thread diameter: M10 x 1.0
- Primary outlet thread pitch: 1 mm
- Quantity per vehicle: 1
Build and materials
- Material: Aluminum
- Rubber components: EPDM compound
- Condition: New
- Country of origin: China
In the box
One master cylinder. A reservoir, a sensor and mounting hardware are not included, so plan on new mounting hardware.
Interchange: 100-1558 · 13-3469 · 11-3392 · 11-3469 · 130.44041 · 130.44043 · 355-75016 · 355-75018
M55339 · NM55339 · NM55339A · MC391317 · 4702830030 · 4702853020 · F144214 · F144215 · MC144214 · MC144215
This part cross-references / interchanges with the following part numbers:
100-1558, 13-3469, 11-3392, 11-3469, 130.44041, 130.44043, 355-75016, 355-75018, M55339, NM55339, NM55339A, MC391317, 4702830030, 4702853020, F144214, F144215, MC144214, MC144215
Frequently Asked Questions
Is this the right brake master cylinder for the 2006-2013 Lexus IS250?
Yes. Dorman M630748 fits the 2006-2013 Lexus IS250, one per vehicle. If your car is a different Lexus, look for it in the "Vehicles it fits" section on this page.
What comes with this Dorman master cylinder, and is the reservoir included?
Dorman M630748 is the master cylinder only. The reservoir, the sensor and mounting hardware are not included.
What thread size do the outlets on this master cylinder have?
The rearward and secondary outlets are both M10 x 1.0, with a 1 mm primary outlet thread pitch. The bore diameter is 0.875 in.
How do I know when an aluminum brake master cylinder needs replacing?
A pedal that sinks or feels soft, fluid at the cylinder, or a brake warning light can be signs. Have a shop inspect the brakes promptly rather than driving on them.
Are the rubber parts in this master cylinder made for glycol-based brake fluid?
Yes. All the rubber components are made of EPDM compound, which resists glycol-based brake fluid.
