brake boosters

[rafael]

Why do some cars have single and other double break boosters? Is it related to the countly or to left vs right hand drive?

[papajam]

For 105 cars with floor (or standing) pedals, a single booster means that the car has single circuit brakes. If there's two boosters, then the car has dual circuit (or tandem) brakes. The only LHD cars that I know of with two remote boosters are the US version 1750s for the 1969 model year. While all LHD cars from about 1970 on got hanging pedals with a tandem brake master cylinder/single booster mounted to the bulkhead, RHD cars retained the standing pedal/dual booster arrangement until about 1977.