Dorman W37855 Drum Brake Wheel Cylinder - Rear

Name: Dorman W37855 Drum Brake Wheel Cylinder - Rear
Brand: Dorman
SKU: BKKX-W37855
Price: 29.92 USD
Availability: InStock

Rear

62 vehicles fit this part

Select your vehicle to confirm fitment

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OE Direct Replacement — Bolt-on fit, no modifications needed

Fitment: Chevrolet, Pontiac, Oldsmobile, Buick, and Cadillac, Venture, Montana, Silhouette, Trans Sport, Lumina APV, Lumina Van, LeSabre, Park Avenue, 88, 98, Bonneville, DeVille, and Fleetwood

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Not what you need? See all Drum Brake Wheel Cylinder options

Reliable Drum Brake Wheel Cylinder for GM Vehicles

The Dorman W37855 drum brake wheel cylinder is engineered to restore proper braking function in select Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models. Designed with durable cast iron construction and precise dimensions, this wheel cylinder ensures consistent hydraulic pressure for safe stopping performance.

Includes bleeder screw for easy brake fluid bleeding
Cast iron casting material for strength and durability
Brake line inlet thread diameter of 10 mm with M10 x 1.0 thread size
Bore diameter of 0.938 inches for accurate fitment
Thread pitch of 1.0 for secure brake line connection
Package contains one drum brake wheel cylinder

Technical Details and Compatibility

The Dorman W37855 wheel cylinder features a 0.938-inch bore diameter and a brake line inlet thread size of M10 x 1.0, matching original equipment specifications. Its cast iron construction provides reliable resistance to wear and corrosion, essential for maintaining brake system integrity. The included bleeder screw simplifies maintenance by allowing trapped air to be released from the brake hydraulics. This part is compatible with a range of General Motors vehicles, including Buick models 88 and 98, Cadillac DeVille and Fleetwood, Chevrolet Lumina APV and Lumina Van, Oldsmobile Silhouette, and Pontiac Bonneville, Montana, Park Avenue, and Trans Sport.

Common Applications and Problem Resolution

Restores braking performance in vehicles experiencing brake fluid leaks
Replaces worn or seized wheel cylinders causing uneven brake application
Addresses spongy brake pedal feel due to hydraulic system issues
Eliminates brake drag caused by stuck pistons in the wheel cylinder
Prevents brake failure from compromised hydraulic pressure

Installation Notes and Tips

When installing the Dorman W37855 drum brake wheel cylinder, ensure the brake system is properly bled using the included bleeder screw to remove air pockets. Verify thread compatibility with the brake line inlet (M10 x 1.0) and inspect all seals and connections for leaks. It is recommended to replace brake shoes and hardware simultaneously to maintain balanced braking performance. Follow manufacturer torque specifications for mounting bolts and fittings.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing dependable performance and durability. The W37855 drum brake wheel cylinder undergoes rigorous quality control to ensure proper fit and function. This part is backed by Dorman's limited warranty, covering defects in material and workmanship under normal use.

Brand	Dorman
Part Number	W37855
Bleeder Screw Cap Included	No
Bleeder Screw Included	Yes
Bore Diameter	0.938
Brake Component Inlet Thread Size	M10 X 1.0
Brake Line Inlet Thread Diameter	10
Casting Material	Cast Iron
Package Contents	1 Drum Brake Wheel Cylinder
Thread Pitch	1.0

This part fits 62 vehicles. Search below:

Year	Make	Model	Position	Notes
2005	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2004	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2004	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2003	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2003	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2002	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2002	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2001	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2001	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2000	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
2000	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1999	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1999	Pontiac	Montana	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1998	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1998	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1997	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1997	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1996	Chevrolet	Lumina APV	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1996	Chevrolet	Lumina Van	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1996	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1996	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Buick	LeSabre	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Buick	Park Avenue	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Chevrolet	Lumina APV	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Chevrolet	Lumina Van	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Oldsmobile	88	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Oldsmobile	98	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Pontiac	Bonneville	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1995	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Buick	LeSabre	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Buick	Park Avenue	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Chevrolet	Lumina APV	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Oldsmobile	88	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Oldsmobile	98	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Pontiac	Bonneville	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1994	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Buick	LeSabre	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Buick	Park Avenue	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Cadillac	DeVille	Rear	Exc. Heavy Duty Brakes; Bore: 15/16 In.; 8.86 In. x 1.77 In. Brakes
1993	Chevrolet	Lumina APV	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Oldsmobile	88	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Oldsmobile	98	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Pontiac	Bonneville	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1993	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Buick	LeSabre	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Buick	Park Avenue	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Cadillac	DeVille	Rear	Exc. Heavy Duty Brakes; Bore: 15/16 In.; 8.86 In. x 1.77 In. Brakes
1992	Cadillac	Fleetwood	Rear	Exc. Heavy Duty Brakes; Bore: 15/16 In.; 8.86 In. x 1.77 In. Brakes
1992	Chevrolet	Lumina APV	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Oldsmobile	88	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Oldsmobile	98	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Oldsmobile	Silhouette	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Pontiac	Bonneville	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1992	Pontiac	Trans Sport	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1991	Buick	Park Avenue	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1991	Cadillac	DeVille	Rear	Exc. Heavy Duty Brakes; Bore: 15/16 In.; 8.86 In. x 1.77 In. Brakes; without Anti-Lock Brake System (ABS)
1991	Cadillac	Fleetwood	Rear	Exc. Heavy Duty Brakes; Bore: 15/16 In.; 8.86 In. x 1.77 In. Brakes; without Anti-Lock Brake System (ABS)
1991	Oldsmobile	98	Rear	Fits 15/16" bore size drum brakes on multiple vehicle models.
1991	Pontiac	Bonneville	Rear	Export; Bore Size: 15/16 Inch

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

134.66022172-151718011898203785534054784-44022F122908W-86022W906651WC14054

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.