A Brake Booster was fitted to many disc-brake B210s, including most 1976-1978 120Ys and all USA models. The booster was added to counter the increased weight of these models. It is a very small 4.5 inch diameter model. This booster is not a direct bolt-in for a (Datsun 1200) as the mounting points are different. It can be fitted to a Datsun 1200 with small modifications.
B210 (including later 120Y) models that use a brake booster use a type M45 Master-Vac with 4.5 inch vacuum diaphragm. It is the same as the 610/180B booster except for a different vacuum hose fitting. It can be fitted to a Datsun 1200 with small modifications.
The booster setup includes:
- a Front Spacer, a thin (20 cm) aluminum adapter so that a 2-bolt vertical pattern Brake master cylinder can be fitted
- 4-bolt rear mounting to firewall
- a Rear Spacer, a thick rectangular aluminum unit (45 mm thick). It fits between the booster and the firewall.
B310 vs B210 style
- B310 has horizontal bolt-pattern master cylinder, Booster M60 (6" diameter)
- B210 has vertical bolt-pattern master cylinder, Booster M45 (4.5" diameter, 5.5" overall)
Use in B110
- B210 Booster
- B210 Master Cylinder & adapter
- Firewall spacer/adapter
The B210 and B310 booster mounts to the firewall with 4 bolts, whereas Datsun 1200 (B110) has only two bolts drilled in the firewall. The shape of the firewall also differs.
- drill larger center hole in firewall
- Use B210 firewall spacer
- drill two extra mounting holes in firewall
- change pedal box to new style
Source: JDM B210 including A12-powered USA B210 ALL 610/710 small booster is the same except for the vacuum hose location
Booster Jidoshakiki Co. Ltd. Bendix License diameter ~120mm width ~140mm flange 87mm thick ~120mm rod to pivot length about 5" diameter
Firewall Spacer 45mm thick bolt pattern: 53mm high x 80/89 wide Master cylinder adapter 20mm thick bolt pattern * 60mm vertical (master side) * 70mm horizontal (booster side)
Master cylinder length ~174mm
47210-H7200 ASSY-MASTER VAC <> 47210-H6100 47211-H6100 SPACER-MASTER VAC B210
Late JDM B210s of GX and GL trim (from April 1975) were fitted with Disc front brakes. A brake booster was standard for GX, optional with GL. The booster is a very small diameter, the M45 Master Vac, same basic type as used in the 510 and 610.
Note that B210 (1976-1978) models without booster used a 2-bolt to 4-bolt adapter plate (thin sheet metal type). 1974-1975 models did not use this.
JDM B210 47210-U0501 MASTER VAC (4-1/2) GX (op.)GL 1973-1975 47210-H6100 MASTERVAC ASSY-BRAKE 1976-1977 A14/L16 (op. others) 47211-H6100 SPACER-master vac
610 JDM 47210-U0501 MASTER VAC ASS'Y (4.5 inch) '72 GL,SSS,'73 DX 47210-U4000 MASTER VAC ASS'Y (6 inch) (from '73) GL, SS 47210-H6100 MASTER VAC ASS'Y-brake (from '74-8) DX 42711-26701 SPACER-master vac
710 JDM 47210-U0501 MASTER VAC ASS'Y-brake (4.5) DX,GL,SSS 47210-H6100 MASTER VAC ASS'Y-brake (from '74-8) DX,GL,SSS 42711-26701 SPACER-master vac
810 JDM 47211-U7400 SPACER-MASTERVAC 42711-26701 SPACER-MASTERVAC <> 47211-U7400 42711-U8700 SPACER-MASTERVAC S,K.LN
Details: JDM B210 - Disc Front Brake models 47210-U0501 MASTER-VAC (45) 1974-1975 * 46010-U0601 CYLINDER ASSY-brake master tandem (3/4 inch) 47210-H6100 MASTER-VAC 1976-1978 * 46010-H7500 CYLINDER ASSY-brake master tandem A12 GL * 46010-U0601 CYLINDER ASSY-brake master tandem A14, L16 47211-H6100 SPACER-master vac 47230-H6100 BRACKET-BRAKE MASTER CYLINDER [for non-boosted brakes]
120Y used the same parts as Japan, except for locally assembled cars.
PBR master cylinder in Australia-assembled car
All North American B210s were fitted with Disc Front Brakes and a very small M45 brake booster. This is the entire brake system of PB110 (Sunny Excellent) specification for 1974-1975 models.
USA 47210-H6100 ASSY-MASTER VAC 47210-H7200 ASSY-MASTER VAC <> 47210-H6100 47211-H6100 SPACER-MASTER VAC B210
Compare to 710 USA 47210-U4000 47210-U5200 -0874 <> 47210-U4000 47210-U6700 0974-0775 47210-U9500 0875- 47211-26701 SPACER-MASTER VAC 610, 710
Compare to 610 USA 47210-U0501 47210-U5200 0873-0874 47210-U6700 0974- 47210-U9500 <> 47210-U6700 47211-26701 SPACER-MASTER VAC 610, 710
Most Datsun used a larger booster than the M45 unit.
This one looks identical to the B210 kit, except the booster is larger diameter. Perhaps it is Datsun 620? Or 810 (200B?)?