Air Brakes, Hydraulic Brakes, and many components
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Plaza Fleet relies on a mix of companies that have proven able to deliver the highest degree of safety and stopping power for both air and hydraulic brakes.
Bendix originally developed much of the technology for air compressors, air dryers, and valves. But Haldex is also innovating and delivering both high quality and low-cost brake components. Gunite produces high quality brake drums and hubs. Meritor provides the biggest umbrella covering the air brake foundation including chambers, slack adjusters, camshafts, and most hydraulic brake components. Full info about brakes will be found on separate pages which you can reach by clicking here: Air Brakes Brake Shoes Brake Drums Slack Adjusters Camshafts Hydraulic Brakes
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     Meritor Q PLUS Cam Air Brake |
Wheel HubsHubs (and wheels) are designed for one of two mounting systems. The most obvious difference is that the nuts that lock the wheel in place in the hub piloted system are two-piece “flange nuts” and the bolt holes are non-chamfered. The nuts used for the older method of mounting have a “ball seat” and the bolt holes are chamfered. A “chamfer” is a widening of the hole where the nut attaches and the ball seat is designed to fit slightly inside the bolt hole rather than completely outside of it. Both of these approaches have been highly engineered and when you follow the guidelines, there is little danger of wheels falling off. Needless to say, it is important to always use the studs and nuts for which the hub was designed.
 Typical Dual Wheel Assembly - Hub Piloted |
 Gunite Wheel Hub |
| | Disc and Spoke Wheel Hubs Currently In Stock |
| | Gunite Part# | Bolt Holes |
| HT799J | Hub, trailer, disc wheel, hub piloted, exciter ring | 10 |
| HT794R | Hub, trailer, disc wheel, hub piloted, aluminum | 10 |
| H389K | Hub, trailer, disc wheel, ball seated, inboard | 10 |
| HT795J | Hub, trailer, disc wheel, ball seated | 10 |
| HR866K | Hub, rear, disc wheel, hub piloted | 10 |
| HF803K | Hub, rear, disc wheel, hub piloted | 10 |
| HR732K | Hub, rear, disc wheel, hub piloted | 10 |
| HR861K | Hub, rear, disc wheel, hub piloted | 10 |
| HR935K | Hub, rear, disc wheel, hub piloted | 10 |
| HR853K | Hub, rear, disc wheel, hub piloted | 8 |
| HR936K | Hub, rear, disc wheel, ball seated | 10 |
| HR556K | Hub, rear, disc wheel, ball seated | 10 |
| HF805K | Hub, front, disc wheel, hub piloted, ABS | 10 |
| HF819K | Hub, front, disc wheel, ball seated or hub piloted | 10 |
| HF801K | Hub, front, disc wheel, ball seated | 10 |
| HF707K | Hub, front, disc wheel, ball seated | 10 |
| RX248K | 6 Spoke wheel, rear |
| RX226K | 6 Spoke wheel, rear |
| RX232K | 6 Spoke wheel, rear |
| RX233K | 6 Spoke wheel, rear |
Brake Chambers or Actuators
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Also known as brake actuators, chambers are an essential component of air brakes. The basic brake chamber is the service brake chamber which can be used alone on a front axle. The service brake is most often used (in tandem) with a spring brake, also known as the parking or emergency brake.
 Haldex Service Chamber Plaza stocks the spring brake in two ways. The spring brake is offered as a “piggyback” unit which must be coupled to an existing service chamber. Or the service chamber and spring brake are sold as a complete unit, a combination brake chamber. Plaza also stocks the air system valves and controls that connect the brake chambers to the dashboard controls and brake foot pedal.
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Haldex also offers Spring Brakes in two grades: The Gold Seal model is the equivalent to the OEM grade with a four year expected life in normal use. For severe duty/vocational use such as the job performed by a refuse, concrete, or dump truck Haldex has its Life Seal model which has a four year expected life in severe duty.
 Haldex GP3030 Gold Seal Piggyback Spring Brake |
For the best corrosion protection
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For the main components of any spring brake the enemies are corrosion and dust contamination. The Gold Seal employs protections such as an epoxy-coated stud housing and a powder-coated spring to fight corrosion. With the Life Seal it is more of the same plus a zinc-plated steel chamber and design refinements to keep contaminants from entering the spring chamber.
Since the added cost of the Life Seal spring brake is never going to exceed the cost of the labor required to replace another spring brake, you cannot make a bad decision by selecting the spring brake with the longest life. Check this link to see how a well-designed spring brake combats corrosion caused by severe duty, vocational use. |
 Haldex Life Seal Complete Spring Brake |
