Hydraulic Drum Trailer Brake Systems

Hydraulic Drum Trailer Brake Systems


Trailer Parts Superstore® offers a wide selection of hydraulic drum brakes and drum brake parts for trailers of all sizes. Shop for complete foundation brake assemblies that bolt right to the axle flange, new brake drums with or without wheel bearings, brake lines and hydraulic brake actuators. We also stock a vast selection of replacement parts for actuators, foundation brakes and drums.


Trailer surge brakes consist of a hydraulic coupler or ACTUATOR, hydraulic BRAKE TUBING, backing plate assemblies or FOUNDATION BRAKES, and brake DRUM & HUB assemblies.

Trailer Drum Brakes work by the "surge" or "push" of the trailer toward the tow vehicle during deceleration which automatically synchronizes the trailer brakes with the tow vehicle brakes. As the trailer pushes against the vehicle, the actuator telescopes together and applies force to its master cylinder, supplying hydraulic pressure to the trailer brakes.

Foundation Brake assemblies (backing plate, brake shoes & springs) are available in 10" & 12" diameters with the two most common designs being UNI-SERVO and FREE BACKING. 'Uni-Servo' brakes have 20% braking power in reverse, therefore they are recommended to be matched with an Actuator that is designed with a 'Back-Up Lock Out' for backing up an incline or over soft ground. 'Free Backing' brakes incorporate a unique design which allows the trailer to 'roll free' while backing up, but they have no braking power in reverse.

When selecting trailer brake components for your trailer, consider the weight of trailer fully loaded with all cargo and equipment. For multi-axle trailers, consider how many axles will be equipped with brakes to meet your stopping requirements. Also, to get the most benefit from your brake system, follow the instructions for care and maintenance in the installation and service manual included with each actuator, foundation brake, and brake tubing kit.

The Tie Down Engineering GalvX: Hydraulic Free Backing Drum Brakes from Tie Down Engineering that features GalvX coated backing plates and brakes shoes as well as stainless steel springs for the most corrosion resistant drum brake. Brake pads are both riveted and bonded to the brake shoes with bronze rivets.

TITAN PREMIER™ Galphorite™: First, the backing plate and shoe levers are sealed using an electrocoat primer - a patented process that actually uses electricity to permanently bond the paint to the surface of the parts - then the backing plates receive an additional coat of rugged acrylic making them virtually corrosion-proof. The wheel cylinders are aluminum, and the internal components are zinc, olive drab plated. Stainless steel springs complete the package.

The electric over hydraulic system is a very adaptable means of supplying robust braking power for a wide range of towing applications. Components of the electric/hydraulic system are mounted on the trailer and consist of an electric/hydraulic power unit, battery, hydraulic lines and hydraulic disc or drum brakes. A 12 volt power supply and electronic signal are supplied from the tow vehicle. The electronic signal is generated by an inertial brake controller of the type typically used with electric trailer brakes.

When the operator applies the tow vehicle service brakes, the tow vehicle controller generates an electronic signal in proportion to the inertia change (slowing) of the tow vehicle. The electric/hydraulic power unit receives this signal and produces hydraulic pressure in proportion to the signal strength. The resulting pressure is distributed throughout the trailer brake system.

Typical applications for electric/hydraulic brake systems range from small single axle utility trailers to large multi-axle recreational vehicles, as well as stock trailers, equipment trailers and flats, receiver, fifth wheel and gooseneck styles. Electric/hydraulic trailer brakes are easily supported by any tow vehicle equipped with an electric brake controller, allowing flexibility in tow vehicle/trailer combinations. Modifications to the tow vehicle are minimal and unobtrusive. Electric/hydraulic brakes are compatible with tow vehicle ABS. The trailer brakes may be applied independently of the tow vehicle brakes. Maximum braking effort is applied to the trailer brakes in the event the trailer becomes uncoupled from the tow vehicle.