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Tri-Symmetrical Slots on a Six-Bolt Land Cruiser Front Hub
DBA DBA4151S is a single 4000 Series front rotor for the Toyota Land Cruiser built from August 1983 through 1989. It is a 302 mm by 20 mm disc on a six-bolt, 139.7 mm PCD pattern, carrying DBA's patented T3 bi-directional tri-symmetrical slot design and Kangaroo Paw pillar ventilation.
Key Features
- 4000 Series construction with DBA's patented T3 bi-directional tri-symmetrical slot design.
- Additional CNC-machined slots increase the number of exit points for pad dust and gases.
- DBA describes the T3 slot as quieter, more responsive and smoother in pedal feel than the older T2 pattern.
- Recommended by DBA for high-performance road use and heavy off-road work, which suits a 60-series Land Cruiser.
- The slot layout is universal, so no left or right specific rotors are needed.
- Kangaroo Paw pillar ventilation and ECE R90 approval number E11*90R02/06*60520*00.
- 302 mm by 20 mm with a 19 mm machining minimum and a 100 mm centre hole.
Fitment
| Vehicle | Axle and build date |
|---|---|
| Toyota Land Cruiser | Built from 8/1983 through 1989, front axle |
The start of the application is a build month, not a model year. Land Cruisers built before August 1983 are outside the range for DBA DBA4151S.
DBA's European catalogue lists the same casting against Toyota Hilux LN105, LN106 and YN106 from 1988 to 1997 and against Land Cruiser 70 series RJ70 and RJ73 with pad reference DB1149. Those are not tagged here because they have not been confirmed for the North American market.
Specifications
| Detail | Value |
|---|---|
| Brand | DBA |
| MPN | DBA4151S |
| Product line | 4000 Series T3 |
| Face design | T3 bi-directional tri-symmetrical slots |
| Diameter | 302 mm |
| Thickness | 20 mm |
| Minimum thickness | 19 mm |
| Hat height | 49 mm |
| PCD | 139.7 mm |
| Bolt holes | 6 |
| Centre hole | 100 mm |
| Ventilation | Kangaroo Paw pillar |
| Handing | Universal, no left or right specific part |
| ECE R90 number | E11*90R02/06*60520*00 |
| Weight | 6.77 kg |
| Sold as | One rotor |
| Matching pad reference | DB1149 |
| UPC | 9316391376893 |
| Warranty | 12 months / 20,000 km / 12,000 miles |
What's Included
- One DBA DBA4151S 4000 Series T3 slotted front brake rotor
About DBA
DBA's 4000 Series is the tier above Street Series, and the T3 slot is the pattern that defines it: three slot groups arranged bi-directionally so the disc does not need to be handed. Combined with Kangaroo Paw pillar ventilation, the series targets sustained heat rejection for performance road and off-road use. DBA DBA4151S is that specification in the 302 mm six-bolt Land Cruiser front size.
Related Parts
- DBA XP Performance front brake pads for 83-90 Toyota Land Cruiser
- DBA SP Performance front brake pads for 83-90 Toyota Land Cruiser
FAQ
Which Land Cruiser build dates does this rotor cover?DBA lists it for Land Cruisers built from August 1983 through 1989, which is why the listing carries the 8/83 start date rather than a plain model year.
Does it matter which side it goes on?No. The T3 slot layout is bi-directional and universal, so one part number serves both sides.
What is the difference between T2 and T3 slots?T3 adds extra CNC-machined slots arranged tri-symmetrically. DBA describes the result as quieter, more responsive and smoother in pedal feel than T2.
What is the bolt pattern?Six bolt holes on a 139.7 mm PCD with a 100 mm centre hole.
Is it suitable for off-road use?Yes. DBA recommends the 4000 Series for high-performance and heavy off-road applications.
How much material is available before it must be replaced?The disc is 20 mm new with a 19 mm minimum, so 1 mm total across both faces.
Which pad does DBA reference for this rotor?European catalogue data lists DB1149 as the matching pad.
Does it carry a European type approval?Yes, ECE R90 number E11*90R02/06*60520*00.
How many rotors do I need?Two for the front axle; DBA sells rotors individually.
Installation Instructions
- Have the rotor fitted by a qualified technician, in line with DBA's guidance for brake components.
- Chock the rear wheels, raise the front of the vehicle on rated stands and remove the front wheel.
- On this generation of Land Cruiser the front hub assembly may need to be dismantled to release the disc, so plan for hub seals and bearing grease before starting.
- Remove the caliper, support it clear of the hose, and separate the old rotor from the hub.
- Clean the hub mating face completely; any rust ridge under a 6.77 kg disc will show up as runout.
- Clean the protective oil from the new friction faces with brake cleaner and fit the rotor without touching the faces.
- Reassemble the hub with the correct bearing preload, refit the caliper to the vehicle manufacturer's torque specification, and repeat on the opposite side.
- Bed in with a series of moderate decelerations from moderate speed before any heavy braking.
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