OE Quality
60-Day Returns

Dorman H621931 Brake Hydraulic Hose - Rear Left or Rear Right
Reliable Brake Hydraulic Hose for Cadillac ATS and CTS
The Dorman H621931 brake hydraulic hose is designed to provide dependable brake fluid transfer for Cadillac ATS and CTS models. Engineered with durable materials, this flexible brake hose ensures consistent performance and safety under various driving conditions.
- Compatible with Cadillac ATS and CTS vehicles
- Constructed with EPDM rubber hose material for flexibility and durability
- Black outer sleeve made of rubber with protective jacket included
- Ends feature treated steel fittings: banjo fitting on one end and female fitting on the other
- Includes gaskets for secure sealing during installation
- Overall length of 13 inches with 11.75 inches axis length
- Bracket material is stamped steel (bracket not included)
Durable Construction and Precise Fitment
The Dorman H621931 brake hydraulic hose features a flexible EPDM rubber hose core with a black rubber outer sleeve and protective jacket to resist wear and environmental damage. The treated steel fittings include a banjo fitting with a 10 mm thread diameter on one end and a female fitting with an M10 x 1.0 inside diameter on the other, ensuring a secure connection to the brake system. This hose is designed specifically for Cadillac ATS and CTS models, providing an exact fit and reliable brake fluid transfer. The package includes necessary gaskets to maintain a leak-free seal during installation.
Common Applications and Problem Resolution
- Replaces worn or cracked brake hydraulic hoses causing fluid leaks
- Addresses brake pedal softness due to hose expansion or damage
- Restores proper brake fluid pressure for consistent braking performance
- Prevents contamination and moisture ingress with durable EPDM rubber material
- Eliminates brake system warning lights related to hose failure
Installation Notes and Tips
When installing the Dorman H621931 brake hydraulic hose, ensure all old gaskets are removed and replaced with the included new gaskets to prevent leaks. Verify the hose routing matches the original to avoid kinks or interference with suspension components. Tighten fittings to manufacturer torque specifications to maintain a secure connection. Bleed the brake system thoroughly after installation to remove air and restore proper brake function.
Quality Assurance and Warranty
Dorman manufactures the H621931 brake hydraulic hose to meet or exceed OEM standards for fit, form, and function. The use of treated steel fittings and EPDM rubber materials ensures durability and resistance to corrosion and wear. This part comes with a limited warranty covering defects in materials and workmanship, providing confidence in its long-term reliability for Cadillac ATS and CTS brake systems.
| Brand | Dorman |
| Part Number | H621931 |
| Axis 1 Length | 11.75 |
| Bracket Included | No |
| Bracket Material | Stamped Steel |
| Color | Black |
| Describe Type | Flexible Hose |
| End 1 Fitting Material | Treated Steel |
| End 1 Fitting Type | Banjo |
| End 1 Thread Diameter | 10 mm |
| End 2 Fitting Inside Diameter | M10 X 1.0 |
| End 2 Fitting Material | Treated Steel |
| End 2 Fitting Type | Female |
| Gasket Or Seal Included | Yes |
| Hose Material | EPDM Rubber |
| Jacket Included | Yes |
| Mounting Hardware Included | No |
| Outer Sleeve Material | Rubber |
| Overall Length | 13 |
| Package Contents | 1 Brake Hose; Gaskets |
This part fits 48 vehicles. Search below:
| Year | Make | Model | Submodel | Body Type | Drive Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2017 | Cadillac | ATS | Base | Rear Left | |||
| 2017 | Cadillac | ATS | Luxury | Rear Left | |||
| 2017 | Cadillac | ATS | Premium Performance | Rear Left | |||
| 2017 | Cadillac | ATS | Performance | Rear Left | |||
| 2017 | Cadillac | ATS | Base | Rear Right | |||
| 2017 | Cadillac | ATS | Luxury | Rear Right | |||
| 2017 | Cadillac | ATS | Premium Performance | Rear Right | |||
| 2017 | Cadillac | ATS | Performance | Rear Right | |||
| 2017 | Cadillac | CTS | Base | Rear Left | |||
| 2017 | Cadillac | CTS | Premium | Rear Left | |||
| 2017 | Cadillac | CTS | Luxury | Rear Left | |||
| 2017 | Cadillac | CTS | Base | Rear Right | |||
| 2017 | Cadillac | CTS | Premium | Rear Right | |||
| 2017 | Cadillac | CTS | Luxury | Rear Right | |||
| 2016 | Cadillac | ATS | Base | Rear Left | |||
| 2016 | Cadillac | ATS | Premium | Rear Left | |||
| 2016 | Cadillac | ATS | Luxury | Rear Left | |||
| 2016 | Cadillac | ATS | Performance | Rear Left | |||
| 2016 | Cadillac | ATS | Base | Rear Right | |||
| 2016 | Cadillac | ATS | Premium | Rear Right | |||
| 2016 | Cadillac | ATS | Luxury | Rear Right | |||
| 2016 | Cadillac | ATS | Performance | Rear Right | |||
| 2016 | Cadillac | CTS | Base | Rear Left | |||
| 2016 | Cadillac | CTS | Premium | Rear Left | |||
| 2016 | Cadillac | CTS | Luxury | Rear Left | |||
| 2016 | Cadillac | CTS | Performance | Rear Left | |||
| 2016 | Cadillac | CTS | Base | Rear Right | |||
| 2016 | Cadillac | CTS | Premium | Rear Right | |||
| 2016 | Cadillac | CTS | Luxury | Rear Right | |||
| 2016 | Cadillac | CTS | Performance | Rear Right | |||
| 2015 | Cadillac | ATS | Sedan | Rear Left | |||
| 2015 | Cadillac | ATS | Coupe | Rear Left | |||
| 2015 | Cadillac | ATS | Sedan | Rear Right | |||
| 2015 | Cadillac | ATS | Coupe | Rear Right | |||
| 2015 | Cadillac | CTS | Sedan | Rear Left | |||
| 2015 | Cadillac | CTS | Sedan | Rear Right | |||
| 2014 | Cadillac | ATS | Rear Left | ||||
| 2014 | Cadillac | ATS | Rear Right | ||||
| 2014 | Cadillac | CTS | Base | Sedan | RWD | Rear Left | |
| 2014 | Cadillac | CTS | Premium | Sedan | RWD | Rear Left | |
| 2014 | Cadillac | CTS | Luxury | Sedan | RWD | Rear Left | |
| 2014 | Cadillac | CTS | Performance | Sedan | RWD | Rear Left | |
| 2014 | Cadillac | CTS | Base | Sedan | RWD | Rear Right | |
| 2014 | Cadillac | CTS | Premium | Sedan | RWD | Rear Right | |
| 2014 | Cadillac | CTS | Luxury | Sedan | RWD | Rear Right | |
| 2014 | Cadillac | CTS | Performance | Sedan | RWD | Rear Right | |
| 2013 | Cadillac | ATS | Rear Left | ||||
| 2013 | Cadillac | ATS | Rear Right |
* 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:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.