Powerbrake X-Line 4WD big brake kits are engineered from the ground up to be the ultimate brake upgrades available on the world market for 4WD vehicles. They deliver significantly improved brake performance, reduce brake fade and vastly improve pedal feel and modulation. The performance gains achieved when fitting our big brake kits vastly outweigh the benefits that can be achieved by fitting upgraded, standard diameter discs and pads. Our civilian X-Line 4WD big brake kits feature direct technology transfer from our R-Line off-road race brake systems that have been used by works race teams to win multiple FIA Cross Country World Championships as well the infamous Dakar Rally (which is regarded by many to be the most gruelling motorsport event on earth).

• X-Line billet 6-piston off-road calipers (featuring stainless steel pistons, internal fluid crossovers, protected bleed screws, internal wiper seals, ultra high-temp pressure seals, all stainless steel hardware, MTR max temp recording system and pad anti-rattle springs).
• High-performance brake pads, pre-loaded into the calipers (featuring OE quality anti-squeal shims).
• Large diameter 1-piece rotors (330mm, 350mm, or 370mm [13″, 13.8″, or 14.6″], depending on the kit configuration), featuring 48 x curved / directional cooling vanes per rotor, MTR max temp recording system and our proprietary black coating that ensures fastest bed-in time.
• Billet caliper mounting brackets (featuring stainless steel thread inserts for the radial mount bolts for max service life).
• Stainless steel braided brake lines (featuring stainless steel end fittings, PVC protective cover, Teflon hose inner and 32 x braid structure).
• All necessary mounting hardware for quick, easy bolt-on installation.
• Comprehensive fitment and bed-in instructions.

• Reduced stopping distances in both wet and dry conditions.
• Reduced brake fade and improved brake consistency.
• Improved initial brake response (bite).
• Improved brake modulation particularly during emergency stops.
• Improved resistance to rotor distortion (warping) and cracking at high temperatures.

At Powerbrake, we believe strongly in the benefits of machining our multi-piston calipers from solid billet. All of our championship winning X-Line and R-Line race calipers are machined from high-grade aerospace aluminum billets, and we’ve chosen to manufacture the X-Line 4WD range from the same material. Machining from billet is admittedly an expensive way to manufacture calipers but it results in a finished product that exhibits exceptional levels of strength and rigidity.

How do we bring our billet X-Line 4WD calipers to the market at such competitive prices? Through significant investment in state-of-the-art 5-axis CNC production equipment that allows us to machine the calipers with maximum efficiency. The fact that we machine all of our calipers from billet, matched to the FEA enhanced caliper designs themselves, results in calipers with an impressive rigidity to overall size ratio. The slim profile of the calipers reduces un-sprung weight and aids with wheel clearance.

Our X-Line 4WD calipers (like their Dakar-spec R-Line counterparts) feature internal fluid crossovers and hidden bleed screws for protection against damage from stone impacts. Every part of the X-Line 4WD caliper is aimed at maximum usability and durability in tough off-road or 4WD conditions.

Our X-Line 4WD calipers are available in two finish options. Either a Red anodize (type-2) or a Dark Grey hard hard anodize (type-3). The anodize dyes used for our Red finish have been carefully selected to offer the maximum UV and temperature resistance to ensure long-term colour retention. The Dark Grey hard anodise is our most durable finish and is the finish that we use on all of our R-Line off-road race calipers.

Powerbrake X-Line 4WD calipers all feature stainless steel pistons. Stainless steel is significantly more expensive to manufacture caliper pistons from than the aluminum pistons used by many of our competitors but the benefits are well worth the investment. Stainless steel transfers heat far slower than aluminum. The result is that stainless steel pistons slow the transfer of heat from the brake pads to the calipers seals and brake fluid, hereby reducing the chances of boiling brake fluid and also extending seal life. Our caliper pistons are manufactured by a special grade of stainless steel that is more than twice as strong as regular 304-grade (in terms of yield and ultimate tensile strengths), while maintain the same levels of corrosion resistance.

The high-tensile caliper cross-bolts used in the assembly of our X-Line 4WD calipers are European sourced and coated with a silver zinc flake coating. This coating offers exceptional corrosion resistance, while having no negative effect on bolt strength at all. The bolt positions of our X-Line 4WD calipers are the result of extensive FEA analysis and deliver optimum caliper rigidity. The cross-bolts are inserted into the caliper from the inboard side resulting in maximum wheel clearance.

All Powerbrake X-Line 4WD calipers feature our MTR system. The system provides a permanent record of the maximum operating temperature reached by the caliper. Feedback from our R-Line race customers has been extremely positive with regards to the MTR system over the years. We therefore decided to apply this same technology to our X-Line 4WD calipers. Customers will really appreciate this feature as it provides valuable data in the support of brake fluid choice etc. The inclusion of a Max Temp Recording system on civilian big brake kit range at no extra charge is unique to Powerbrake on the world market.

All other caliper hardware components (including: pad retaining pins, bleed screws and pad abutments) are manufactured from stainless steel to ensure highest levels of corrosion resistance.

The brake lines included with our X-Line 4WD big brake kits feature an extruded Teflon inner lining that is highly resistant to the aggressive chemical properties of modern brake fluids, as well as being able to handle far higher temperatures than rubber. The Teflon lining is covered by 32 strands of tightly woven stainless steel braid that acts as the muscle of the hose, providing incredible resistance to expansion under pressure. Our stainless braid is covered with a polymeric outer layer that prevents dirt from getting between the stainless braid and the Teflon inner lining. The end fittings on our hoses are all machined from grade-304 stainless steel as opposed to the plated, mild steel fittings used by many of our competitors. The resulting hose assemblies offer the best possible pedal feel, matched to excellent durability and corrosion resistance.

X-Line 4WD caliper mounting brackets are machined from billet aircraft grade aluminium alloy, FEA enhanced for strength and rigidity and (type-3) hard anodised. One detail to note is that we use stainless steel thread inserts for the radial mount bolts that secure our X-Line 4WD calipers to the caliper mounting brackets. Since our X-Line 4WD calipers feature a solid caliper re-enforcement bridge, you need to remove the two caliper radial mount bolts in order to change pads. For this reason we use thread insert in our mounting brackets to achieve maximum thread strength and durability. Similar thread inserts are used extensively  in the aerospace industry due to their increased strength over conventional aluminum threads.