Troubleshooting Brakes Locked Up on Surge Brake Coupler
Updated 09/26/2025 | Published 04/21/2025
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Question:
I purchased a surge coupler from you about 2 years ago. Disc brakes While towing the trailer today, the brakes locked up driving forward to the point that I had to relieve pressure by opening the caliper zerks to get the wheels to turn. of course, now I do not have working trailer brakes. I do not have a visible shock absorber as identified as a potential problem in one of your parallel posts. Also, both wheel calipers froze up together so I don’t think it is a caliper problem. I’m thinking the master cylinder failed/frooze in a “braking” position. Prior to this the system was working great. What do you think??
asked by: Gene L
Expert Reply:
Hi Gene; I agree it is probably the master cylinder. I'm not 100% sure about the shock absorber since I don't see your order to know what actuator it actually is. However, I can't imagine you not seeing it is an issue if it worked for the last two years. If it is a Dexter Model 60 the correct master cylinder replacement is the # T4820000.
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Product Page this Question was Asked From
Replacement Shock Absorber for Dexter Model 60 Brake Actuators
- Accessories and Parts
- Brake Actuator
- Disc Brakes
- Hydraulic Drum Brakes
- Shocks
- Dexter
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Robin H.
9/26/2025
Hi Gene, did replacing the master cylinder solve the issue with your trailer brakes? I'm asking because your experience could help others facing similar brake problems.