PB44L Big Brake Kits
(available with 330x32 or 350x34mm discs)
Our PB44L big brake kits are 'professional-grade' kits that have earned an excellent reputation on race cars both in domestic and export markets The kits are identical to those that we supply to various A & T-Class Production Car race teams as well as Touring Car teams in the USA. Our PB44L calipers are designed for use on medium weight race cars and track day cars weighing up to 1600kg. The kits include our massive PB44L 4-piston billet calipers that feature our separate pad-per-piston technology, which eliminates the occurrence of tapered pad wear and provides unmatched pedal feel and feedback. The separate pad-per-piston design also allows for a large, solid billet caliper bridge to be positioned low between the pads resulting in unmatched rigidity and reduced caliper flex under braking.
Unlike some multi-pad OEM calipers that use thin padlets with small friction material surface area in their designs, the pads used in our PB44L caliper are 17mm thick and have a combined pad surface area that rivals many 6-piston calipers on the market. These calipers have comfortably outperformed competitive 6 & 8 piston calipers in back to back tests under race conditions. While our PB44L calipers are designed to withstand the extreme conditions encountered in professional motor sports, they feature full internal dust seals that keep road debris away from the pressure seals and other key components. This makes the calipers suitable for long term road use as well.
The 2-piece, floating GT-Series discs included in our PB44L kits are made up of a rotor friction ring attached to a lightweight aerospace grade aluminium mounting hat or bell. The two parts are held together by twelve high-tensile drive bobbins and custom made bolts. We produce a range of different drive bobbins that allow us to adjust the amount of axial float from zero (in which case the discs can expand and contract radially without interference but do not float axially) to 0.6mm axial float used in certain race applications. At Powerbrake, we refer to disc assemblies with zero axial float as “semi-floating” discs and most of our PB44L kits intended for crossover street/track day applications are delivered with semi-floating disc assemblies due to their quiet operation.
Our semi-floating disc assemblies allow the rotor friction rings to expand and contract independently from the rotor hats, which dramatically reduces stresses within the rotor caused by expansion at high temperatures. The design results in improved pedal consistency as well as reduced disc distortion and cracking. Our full-floating assemblies, which allow for both radial expansion and axial float also allow the rotor to center itself within the caliper and can reduce piston knock back issues that result from extreme bearing flex under cornering in race applications. Generally we limit the supply of full-floating rotor assemblies to non-street applications as a rattling sound will be heard from the full floating discs when driving over uneven surfaces on public roads.
As with all our big brake kits, each kit is tailored to the target vehicle in question. This involves careful software modeling of correct brake balance, brake torque outputs and pedal travel. The result is that the caliper piston diameters in each kit are specified to match the target vehicle in question. Brake balance with the kit is optimised to suite the ABS, EBD and other vehicle stability control systems.
Our PB44L big brake kits include:
- 2 x Powerbrake PB44L billet calipers featuring our separate pad-per-piston technology and heavy duty stainless steel pistons
- 2 x Powerbrake 2-Piece GT Series floating discs (330x32 or 350x34mm in diameter). Featuring our staggered cooling vane technology for substantially improved disc cooling
- 2 x 7075-T6 Billet caliper mounting brackets
- 2 x Powerbrake DuraLine s/steel braided brake lines with grade-303 stainless steel fittings.
- Endless synthetic high-temperature brake fluid.
- All necessary mounting hardware.
- Comprehensive installation and bed-in instructions including assembly diagrams.
- The kit price excludes pads, which are quoted on separately depending on each customer's requirements. We can supply over 70 different high-performance street, crossover and competition pad compounds for our PB44L calipers.
For more detailed information on the components in our PB44L kits please click on the links below:
