Dorman M639008 brake master cylinder for the 2000-2002 Chevrolet Astra turns pedal force into hydraulic pressure for the brakes. This Dorman brake master cylinder has a housing built to match the casting material of the original part, so performance stays similar.
- First Stop line master cylinder with two outlets
- Aluminum body with a 0.938 in bore diameter
- All rubber components are made of EPDM compound that resists glycol-based brake fluid
- Made entirely of new materials
- Made to meet rigorous SAE International standards
Quick facts
- Part: Dorman M639008 brake master cylinder
- Fits: 2000-2002 Chevrolet Astra
- Material: Aluminum
- Condition: New
A soft or slowly sinking brake pedal, or brake fluid around the cylinder body, can mean the master cylinder is worn. These signs alone do not prove this part is the problem, since a leaking brake line can feel the same.
Fits
This is a direct-fit replacement for the 2000-2002 Chevrolet Astra, which takes one master cylinder.
Specifications
Fit and size
- Quantity per vehicle: 1
- Bore diameter: 0.938 in
- Number of outlets: 2
- Rearward outlet size: M10 x 1.0
- Secondary outlet thread diameter: M12 x 1.0
- Primary outlet thread pitch: 1 mm
Build and materials
- Master cylinder material: Aluminum
- Rubber components: EPDM compound
- Condition: New
- Country of origin: China
In the box
One master cylinder. The reservoir, sensor and mounting hardware are not included, so plan on new mounting hardware, as the old pieces may not be reusable.
Interchange: M100-9003 · 130.99003 · 355-92002
9193225 · F900037
This part cross-references / interchanges with the following part numbers:
M100-9003, 130.99003, 355-92002, 9193225, F900037
Frequently Asked Questions
Is this the right 2000-2002 Chevrolet Astra brake master cylinder?
Yes. Dorman M639008 fits the 2000-2002 Chevrolet Astra, which takes one master cylinder.
Does this Dorman master cylinder come with the reservoir and sensor?
No. The box holds the master cylinder only. The reservoir, sensor and mounting hardware are not included.
What thread sizes do the outlets on Dorman M639008 have?
The master cylinder has two outlets. The rearward outlet is M10 x 1.0, and the secondary outlet thread is M12 x 1.0.
What are the rubber parts in this brake master cylinder made of?
All rubber components are made of EPDM compound, which resists glycol-based brake fluid. The cylinder body is aluminum.
Why does my brake pedal feel soft or sink slowly?
A soft or sinking pedal, or fluid wetness at the cylinder body, can come from wear in the master cylinder. Have the brakes inspected promptly and do not keep driving on them.
