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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.
Contents |
Overview
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)
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- B210 has vertical bolt-pattern master cylinder, Booster M45 (4.5" diameter, 5.5" overall)
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Use in B110
Required parts:
- 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
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- OR Make 4-bolt to 2-bolt spacer/adaptor to go between the firewall and the booster
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- drill two extra mounting holes in firewall
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- change pedal box to new style
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H61 Mastervac
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
JDM
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]
Australia
120Y used the same parts as Japan, except for locally assembled cars.
See 1977-1979 Australian Rectangle Reservoir Brake Master
PBR master cylinder in Australia-assembled car
USA
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
H61 or 267 spacer?
Large Booster
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?)?
620 adapter is only about 10mm thick (B210 is 20mm)
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