Chassis and Running Gear
Trailer Brake Service: Electric, Surge and Electric-Over-Hydraulic
Typical range
$300 to $5,500
Shop hours
1 to 22
Labor rate
$260/hr
The short answer
Trailer brake service covers electric drum brakes, surge couplers, and electric-over-hydraulic systems including magnets, shoes, actuators, and wiring. Work runs $300 to $5,500, or 1 to 22 hours at $260 per hour plus parts, performed at our Yorba Linda facility.
01
What this work actually involves
Electric drum brakes fail in a predictable order and most owners catch them late. The magnet wears first, losing its face and its amperage draw, so braking effort quietly drops until the tow vehicle is doing nearly all the work. Then a magnet wire chafes through at the backing plate and that wheel stops braking entirely, which shows up as a pull under braking. Then the shoes glaze from being asked to do too little too hot. We measure magnet current draw at each wheel rather than judging by feel, because a system that stops the trailer adequately on flat ground can still be seriously unbalanced.
Grade is what exposes the deficiency in Southern California. Descending from Big Bear Lake or coming down the 15 off the Cajon Pass puts sustained heat into trailer drums for miles at a time. A drum that is out of round or a set of shoes that is glazed will fade, and the driver interprets that as the controller needing more gain, which puts more heat in and makes it worse. Any trailer that regularly runs mountain grade needs its brakes measured, not just adjusted.
Surge brakes on rental and utility trailers and electric-over-hydraulic systems on heavier fifth wheels each bring their own failure set. Surge actuators seize at the master cylinder and the shock, particularly on units that have been dunked at a boat ramp, and the trailer either brakes constantly or not at all. Electric-over-hydraulic actuators fail electrically far more often than hydraulically, which means the diagnosis starts at the connector and the ground, not at the caliper.
Systems and brands we work on: Dexter, AL-KO, Lippert.
Location: All work is performed at our Yorba Linda facility. We do not offer mobile, roadside, or fleet route service.
02
What the job includes
- Magnet current draw measurement at every wheel under controller command
- Electric brake magnet, shoe, spring, and adjuster replacement
- Drum measurement for out-of-round, taper, and maximum diameter
- Backing plate and complete brake assembly replacement
- Trailer brake wiring, ground, and connector repair
- Surge coupler actuator, master cylinder, and shock service or replacement
- Electric-over-hydraulic actuator diagnosis, bleed, and replacement
- Disc brake pad, rotor, and caliper service on hydraulic trailer systems
- Breakaway switch and breakaway battery testing and replacement
- Brake adjustment and balance verification across all axles
03
When you need this service
- A tow vehicle that feels like it is doing all the braking
- A trailer that pulls to one side when the brake controller is applied
- Brake fade after a sustained descent that recovers once cooled
- A brake controller that has to be turned up steadily over time to feel the same
- One hub running noticeably hotter than the others after a drive
- Grinding or scraping from a wheel that changes with brake application
- A breakaway switch that no longer applies the brakes when tested
04
How we do it, step by step
- 01
Controller and circuit test
Output measured at the connector and at each wheel under commanded braking. A weak circuit or a bad ground mimics worn brakes and costs nothing to rule out first.
- 02
Magnet draw measurement
Current draw measured at each magnet and compared wheel to wheel. This is what reveals an unbalanced system that still feels adequate on flat ground.
- 03
Drum pull and measurement
Drums pulled, inside diameter measured for out-of-round and maximum wear, and shoe surfaces inspected for glazing and heat checking.
- 04
Documented findings
Measurements photographed and priced by wheel, so you can see which axle is actually the problem rather than approving a blanket replacement.
- 05
Component replacement
Magnets, shoes, springs, adjusters, or complete backing plates replaced, and drums replaced when measurement exceeds the wear limit rather than turned thin.
- 06
Wiring and breakaway correction
Chafed magnet wires rerouted and protected, grounds cleaned to bare metal, and the breakaway switch and battery tested under actual applied load.
- 07
Adjustment and balance verification
Brakes adjusted, current draw rechecked across all wheels, and the trailer stopped under controller command to confirm even braking before delivery.
05
Pricing and posted rates
| Item | Rate or range | Notes |
|---|---|---|
| Typical job range | $300 to $5,500 | Varies with extent of damage and parts availability |
| Shop hours | 1 to 22 | Quoted after teardown, not before |
| Mechanical and electrical labor | $260 per hour | 2026 posted rate |
| Parts | 100% markup under $100, 35% over | Special order parts require a non refundable deposit at order |
| Deposit | 50% at authorization over $2,000 | Additional 25% when parts arrive on jobs over $10,000 |
| Sales tax | 7.75% on parts and materials | Labor is not taxed |
Insurance billed jobs may be billed at carrier negotiated labor rates that differ from the posted retail rates above. See all posted rates.
07
Vehicles we do this work on
Vehicle
Travel Trailers
A travel trailer tows from a ball hitch behind the tow vehicle rear axle on an A-frame tongue, which makes it the most sway-prone
Vehicle
Standard Fifth Wheels
A fifth wheel couples to a hitch in the truck bed through a kingpin and pin box, with a raised forward bedroom over the truck. The
Vehicle
Toy Hauler Trailers
A bumper pull toy hauler carries cargo behind the axles on a ball hitch, which is the worst possible combination for tongue weight
Vehicle
Toy Hauler Fifth Wheels
A toy hauler fifth wheel carries a cargo garage behind the axles with a full-height rear ramp door. Load behind the axle centerlin
Vehicle
Utility Trailers
A utility trailer is an open deck on a welded frame with fenders, a ramp gate, and lighting, and it fails through deck rot, frame
Vehicle
Teardrop Trailers
A teardrop is a small monocoque sleeping trailer, usually 4 to 6 feet wide, with a rear galley under a lifting hatch. The hatch se
Vehicle
Pop-Up Campers, Tent Trailers
A pop-up camper is a low box trailer with a lifting hard roof, canvas walls, and fold-out bunk end decks. The lift system, the bun
08
Questions about electric, surge and hydraulic brake service
Frequently asked questions
How much does trailer brake service cost?
Brake service runs $300 to $5,500, or 1 to 22 hours at $260 per hour plus parts. Adjusting brakes and repairing a chafed magnet wire on a single axle sits near the low end. Replacing complete backing plate assemblies, drums, and wiring on a triple axle fifth wheel with electric-over-hydraulic actuation sits at the high end.
How often should trailer brakes be inspected?
At least annually, and before any trip that involves sustained mountain grade. Magnets and shoes wear gradually enough that you compensate at the controller without noticing, so the deficiency only becomes obvious on a long descent when you need everything the system has. Measurement is the only reliable way to catch it early.
Why does my trailer pull to one side when braking?
Almost always one wheel not contributing while the others do. The usual causes are a chafed magnet wire at the backing plate, a corroded ground, a seized adjuster, or a magnet worn past its friction face. We measure current draw at each wheel under commanded braking, which identifies the dead one in minutes rather than pulling every drum on a guess. The wire chafe version is the most common and the least expensive to correct.
Do you service surge brakes?
Yes. Surge coupler actuators, master cylinders, and dampers are all serviced here, along with the drum or disc hardware behind them. Trailers that have been backed into salt water at a boat ramp are the common problem case, since the actuator internals corrode and the trailer ends up either dragging its brakes or not braking at all.
Is this the same as vehicle brake work?
It overlaps but is not identical. We service brake, axle, bearing, and suspension systems on trailers and van chassis. We do not perform engine, drivetrain, or transmission work, and we do not perform DOT inspections. If your repair needs falls outside that scope we will say so directly rather than book the vehicle in.
09
Related services
Service
Brake Service, Pad Rotor and Caliper
Disc brake service covers pad and rotor replacement, caliper rebuild and replacement, hose inspection, and fluid service on traile
Service
Wheel Bearing Repack and Hub Service
Wheel bearing service covers cleaning, inspection, repacking, and seal replacement on trailer and towable hubs, plus race and bear
Service
Axle Service and Replacement
Axle service covers bent axle diagnosis, camber and toe measurement, spindle repair, and complete axle replacement on trailers and
Service
Tow Hitch and 7-Way Wiring Installation
Tow hitch and wiring installation covers receiver hitch mounting, 7-way and 4-way connector wiring, brake controller integration,
Service
Pre-Trip Body and Structural Inspection
A pre-trip inspection checks the items that strand people: tires and date codes, bearings, brakes, seals, slides, hitch, and frame
10
More chassis and running gear work
Ready to move on electric, surge and hydraulic brake service? Bring it to Yorba Linda.