TurboBrake HB427-4M 4-Piston Brake Calliper

• TurboBrake HB427-4M is eSN's high-end 4-Piston hydraulic calliper which is factory stock on flagship Teverun Fighter models.
• Drop-in high-end replacement for most of the common stock callipers on most makes/models of eScooters.
• 4M designation = 4-Piston Motocross (4S = standard). This is a higher class product standard 4-Piston callipers such as HB427-4S and those of Logan, Zoom and NUTT.

• Available in Left or Right orientation. This orientation defines the location of the hydraulic line termination as you look at the outer side of calliper mounted on scooter. For example, a calliper with right orientation, sitting on top of swing arm will suit rear right hand side of scooter & front left hand side. It will also suit front right hand side if located "behind the fork". See notes for further info, as a general guide:
  • NAMI = Left.
  • Kaabo Warrior = Right with exception to the GTR which adopts Left at front.
  • Kaabo Mantis 8/10 = Left.
  • Teverun Fighter = Left.
  • Dragon Hurricane = Right orientation.
• Supplied with Long or Short flexible steel whip hydraulic line (flexi hose), which has slightly larger outer diameter than typical BH59 type.
  • Short, for front is 1.28 meters length (1280mm).
  • Long, for rear is s 2.1 meters length (2100mm).

Lengths derived from that of NAMI Logan 4-Piston (Burn-e) which is the most generous of all common 11" wheel scooters. Teverun adopt 1230mm (50mm shorter) and 2100mm (identical). If needing longer, eSN has joiners (couplers) and flexi hose with factory fitted (crimped) connectors to extend 150mm. Hose terminates on the inside of calliper, on a slightly more favourable angle than that of Logan 4-piston to help clear tyre sidewall (see notes). The inside termination reduces exposure of hose to damage and the factory crimped connectors form a robust connection on both ends. This negates need for olive (bushing), compression nut, cover (hood/boot) on the lever end. As the termination is crimped, clearance to route needs be accommodated as mentioned below in notes (alternatively use existing hose). A pair of M6 x 18mm socket head bolts with washers are included to secure bracket to swing arm.

• Supplied with "Ears" Pads (this is the factory pad, all-metal, non finned). eScootNow also stocks Ceramic pads. Callipers also support the slightly narrower pads of NUTT YD-03 cooling enhanced (resin/ceramic) and Logan 4-Piston type which opens up options to 4 compound types.
• The two red piston caps are presented on the outer side. Current stocks are unbranded (TurboBrake branding expected through Q4 2025). There are also some Left's available with "Teverun" branding, which is printed on the inside surface (not visible when fitted) as our initial samples were undertaken with Teverun factory spares.
• Apply coupon code TURBOBRAKE-SET at checkout for 14% discount on cart of complete set comprising two callipers and two levers.

Notes:

1. Typically paired with the levers of TurboBrake or the higher end CNC Ball Bearing Edition.
2. Examples of Left and Right orientation adopted on popular makes/models (always check your own build):
   1. NAMI has Left orientation.
      Rear is on the left hand side above swing arm, hence Left. Front is on the right hand above swing arm on Burn-E and Klima, and on left behind the "forks" on Blast which are all Left orientation.
      
      Image: Ride & Glide
   2. Kaabo Wolf Warrior Series has Right orientation with exception for GTR front.
      
      On GTR, for the rear with HB427-4M it is observed a washer needs be fit between the 3mm Kaabo stock rotor and motor hub to provide adequate clearance of the calliper against motor hub.
   3. Dragon Hurricane has Right orientation.
      Rear is on the right hand side above swing arm, hence Right. Front is on the right hand side, behind the "forks" hence right.
      
3. Consider adding a TurboBrake Brake Bleed Adaptor: This specific sized adaptor is not included in the common bleed kits. This adaptor suits all TurboBrake HB427 series brakes (including the Yellow Dragon branded callipers) and is identical to that in the Teverun bleed kit. This adaptor is long and skinny, with only a small amount of thread on the end of the adaptor forming connection with the TurboBrake lever (approx ~1mm of thread bites as the O ring compresses, apply force in turn). eSN recommends having two adaptors for full bleed top and bottom. Without these adaptors you would need resort to augmenting the common bleed kit adaptors with O rings and/or plumbers tape.
   
4. The IS Mount bracket (adaptor) mounts the calliper to the scooter. The 160mm (rotor size) is adopted using industry standard bracket naming convention, however not all makes/models of eScooters adopt this convention (for example, Kaabo Wolf with 160mm rotors use a F-160 R-140 bracket on rear). Often eScooters will require a different size bracket to the standard convention to seat the calliper appropriately relative to the rotor. There are two common types:
   • F-180 R-160 bracket (supplied with HB427-4M left long & right long):
     Taller bracket: 22 & 22mm offset (height).
     This bracket is adopted on NAMI Burn-e, Kaabo Wolf Warrior 11/GT Series and Factory Teverun Fighter 11 front/rear. Note some Wolf Warrior's are observed with a special 19 & 19 bracket on Zoom 2-piston callipers which has no requirement for accompanying washers (see image in note further below).
   • F-160 R-140 bracket (supplied with HB427-4M left short, right short):
     Shorter bracket: 11mm & 7mm offset (height).
     Adopted on NAMI Klima. Near identical to that of the Kaabo Wolf Warrior King/GT rear (Wolf is precisely observed as 12/7).
     
     If renewing, typically existing brackets are used as TurboBrake HB callipers have similar shape and pad placement as stock eScooter callipers. If special purpose bracket is or spacers are required (including for rotor size uplift) consider some of these picks from AliExpress:
     • MUQZI Brackets. The B(IS)
       The B (IS, International Standard) "004" F-203 R-180 is an alternative to F180-R160. Used when fitting larger rotors as shifts the calliper position laterally (horizontal) for appropriate angle.
       The A (PM, Post Mount) "005" F-203 R-203 & "006" F-180 R-180 stacks on top of B(IS) brackets. "005" also available here.
       
       
     • ABS Spacers from Grey Eteri Store and HUJI Store make a tidy finish compared to stacking washers. Use M6.2 internal diameter for the M6 bolts, 9mm external diameter. Similar to the M5.2's in the TurboTight NAMI Klima Fender Spacer Kit. Alternatively you could use 6x8 or 6x10 copper sleeve
       AN DE LI Hardware Fitting Store or U Officer Store.
       
5. Image on left (or top) shows the HB427-4M fitted to rear of NAMI Klima with the stock F-180 R-140 bracket and stock 140mm rotor. A slight shave to the swing arm brake mount plate was undertaken to accommodate the calliper body. By way of comparison, image on right (lower) shows Magura MT5e on NAMI Burn-e with aftermarket 160mm (stock size) rotor. Magura callipers typically require quite an orchestrated ensemble of bracketing. In this instance a PM bracket is stacked on top of the IS Mount (piggy backed). This shifts the placement to accommodate Magura design. In the Magura photo you can see that one of the pistons is not seated appropriately to align the pad to the rotor (it is too high). Ideally that bracket should be shaved down and/or a more appropriate bracket(s) and washers assembled. Magura are troublesome as they are further removed in placement than typical stock eScooter callipers
   
   
6. Clearance on Burn-e (rear) with ULIP 100/55-6.5 HP-1005 across
   1. Logan 4-Piston (yellow hose)
      vs
   2. TurboBrake HB427-4M (this calliper).
      
7. Zoom 2-piston to HB427-4M uplift on Teverun Fighter 11 series. The HB427-4M is stock on current Fighter Supreme Ultra and 7260R models. Earlier 7260R models had the HB427-4S calliper.
   
   
8. Image below shows the hydraulic line (hose) supplied with TurboBrake callipers which is a steel whip shown with silver connector on the right. It has factory crimped TEKTRO style fitting which forms a resilient connection. Allow for the clearance of this when routing through eScooter deck/stem etc. The connector negates need for traditional insert (needle/barb), olive and compression nut, but you can use that traditional hose if you wish (ideally TEKTRO barb, or BH59 barb, both with BH59 olive). The type on left is a TEKTRO barb (with BH59 olive) as featured on TurboBrake 2-Piston HB427-H and standard 4-Piston HB427-4S callipers. Both adopt the TEKTRO standard as noted by presence of the o'ring to act as washer/gasket - ensure o'ring is present for proper seal on TEKTRO. Both adopt the common thread of M8 (0.75 pitch) adopted by most eScooter brake levers, allowing connectivity to existing levers such as Zoom, Logan and NUTT levers and callipers that adopt BH59 olive such as Logan.
   
   
9. Bracket offset (height) is the distance from centre of threaded hole in the bracket that connects to the scooter to the surface of the edge of bracket where the calliper sits. Sometimes brackets are labelled with a nameplate on the underside. Image below contrasts some of the brackets as observed on Kaabo/Zoom callipers:
   
   
10. US spelling caliper.