Thread: BraKe systems Series 3 1976

Hello All,

For some reason Photo 003 did not load up properly - so here is my 2nd attempt cross fingers.

Kind Regards
Lionel

G'day All,
Lionel, the 4 cyl's diesel did have power boosted brakes as an optional extra, (on the S3) the engine intake manifold was fitted with a butterfly valve to create vacuum, alternativley you could fit an alternator with a vacuum pump for the brakes.
I wrecked a 1982 4cyl diesel a few years ago, it was fitted with brake booster n dual circuit brakes, it also had a 5 main bearing engine, anyway hope that is of some help, cheers Dennis
Ps. You will need to plumbing oil feed and return line for brake vac/pump,,.

Originally Posted by Dinty

G'day All,
Lionel, the 4 cyl's diesel did have power boosted brakes as an optional extra, (on the S3) the engine intake manifold was fitted with a butterfly valve to create vacuum, alternativley you could fit an alternator with a vacuum pump for the brakes.
I wrecked a 1982 4cyl diesel a few years ago, it was fitted with brake booster n dual circuit brakes, it also had a 5 main bearing engine, anyway hope that is of some help, cheers Dennis
Ps. You will need to plumbing oil feed and return line for brake vac/pump,,.

Hello Dinty,

Thank you for the very useful information it gives me something to work off as a starting point.

Kind Regards
Lionel

The later series diesels also had a vacuum tank fitted to help the booster as you don't get much vacuum from a diesel I have photos if you need them

Originally Posted by lro11

The later series diesels also had a vacuum tank fitted to help the booster as you don't get much vacuum from a diesel I have photos if you need them

G'day Iro11,

Thank you for your reply - PM sent.

Kind Regards
Lionel

The above covers it. The Series 3 production period saw both boosted and dual circuit brakes being introduced on Landrovers in Australia, although listed as optional in the parts books. (boosted brakes were optional on Series 2a, and, I think, were always standard on six and V8, at least in this country). The dual brake system uses the different pedal box.

The diesels produced vacuum for the brake booster from a butterfly valve on the intake. This is linked to the throttle and adjustment is critical - it needs to be shut when you take your foot off, and to open fully with only small movement of the accelerator.

The Stage 1 Isuzu had a vacuum pump on the alternator, unless I am mistaken.

John

Originally Posted by JDNSW

The above covers it. The Series 3 production period saw both boosted and dual circuit brakes being introduced on Landrovers in Australia, although listed as optional in the parts books. (boosted brakes were optional on Series 2a, and, I think, were always standard on six and V8, at least in this country). The dual brake system uses the different pedal box.

The diesels produced vacuum for the brake booster from a butterfly valve on the intake. This is linked to the throttle and adjustment is critical - it needs to be shut when you take your foot off, and to open fully with only small movement of the accelerator.

The Stage 1 Isuzu had a vacuum pump on the alternator, unless I am mistaken.

John

G'day John & Others,

If I was to upgrade the 1976 single circuit non-servo boosted diesel up to a dual circuit boosted system which method of getting vacuum: 1) butterfly valve or 2) a vacuum pump on the alternator is the most reliable and efficient? Plus easier to get parts for?

Kind Regards
Lionel

Originally Posted by Lionelgee

G'day John & Others,

If I was to upgrade the 1976 single circuit non-servo boosted diesel up to a dual circuit boosted system which method of getting vacuum: 1) butterfly valve or 2) a vacuum pump on the alternator is the most reliable and efficient? Plus easier to get parts for?

Kind Regards
Lionel

1. Cheapest and simplest, which is why it was used. Also gives a standard installation. But parts would almost certainly have to be second hand, and should be carefully inspected, especially for wear on the butterfly shaft and join to manifold, which could allow in unfiltered air. Also as noted above, linkage adjustment is critical.

2. Technically the best. But you would need to do the research to find a suitable alternator and design, supply and fit oil supply and drain for the pump. Probably my preferred solution, although I don't think it is black and white.

But if it were my vehicle I would be inclined to stick with the original brakes. These, properly maintained, are quite adequate for the relatively modest performance of the diesel. It may be worthwhile considering increasing actual braking capability rather than number of circuits and decreasing pedal pressure, especially if it is a swb. For the swb the brakes (especially front + M/C) from a 109 can be fitted, and for a 109, you can fit the wider front brakes off a six/V8, which were fitted to all 109s in late production.

While in theory, the fitting of a dual brake system decreases the risk of unexpected brake failure, in real life the risk of this is very, very low, provided the system is properly maintained. While modern vehicles rely on warning lights and "never lift the bonnet between services" with vehicles of this era, you should check for fluid level and leaks whenever you check the engine oil and coolant - perhaps not every day, but certainly every few days.

John