New blog posts
Heavy Duty Brake Upgrades
Heavy Duty Brake Upgrade.
HEAVY DUTY BRAKE UPGRADE
FOR TOYOTA LANDCRUISER
79/ 70 SERIES
Heavy Duty Caliper Design.
Bigger Rotors and Pads.
The Upgrade Solution.
REAR BRAKE PROBLEMS
The Toyota Landcruiser 79/70 series vehicles are Australia's most popular 4WD and in particular are favoured in underground mining where the conditions are notoriously harsh, extreme and corrosive.
In this work environment the Toyota rear disc brake/ drum park brake arrangement proves inadequate with the rear pads and handbrake generally showing accelerated, premature wear.
Combining a disc brake and drum park brake within a 16in wheel compromises the size of both within the limited space. An overly complicated design results that is costly to maintain and proves inadequate for safe braking.
The rear brake with its inner park brake arrangement becomes inundated with mud and slurry which then can't escape. These abrasives quickly render the park brake inoperative and unsafe.
The Upgrade Solution
Leaving the front brakes alone as they reportedly work satisfactorily, the aim was for a large, simple, robust caliper with bigger pads and a heavy duty rotor.
To achieve the extra space needed for a bigger caliper, the park brake is moved up on to the transfer case.
The prop shaft is re-used without need for shortening.
TRANSMISSION MOUNTED PARK BRAKE
Available separately if required
The Park Brake caliper and disc rotor assembly is easily attached to the transfer case by way of an adapter plate and bolts. No tail shaft shortening is required.
The caliper selected is designed for harsh corrosive conditions with an additional steel cover plate protecting it from mud and water.
A heavy steel lever connects the Park brake to the re-routed original cable for fail safe operation.
Standard disc brake/drum park brake.
Heavy Duty Caliper design
It is common automotive practice for rear brakes to be proportionally smaller than the fronts in order to achieve braking balance.
The heavy duty upgrade brakes use a big front brake type caliper to give the larger pads. To achieve the necessary proportional balance the calipers are sleeved down using stainless steel.
Rotors and Pads
Without a park brake to be included, the rear rotor was able to be enlarged in both diameter and thickness. By bolting the new rotor to the hub similar to the front, the rotor becomes 300mm dia and 28mm thick (18mm standard) with pad contact area almost doubled.
“Mine Pack” special pad material for both the upgraded rear disc brakes and the park brake is formulated for optimum stopping performance and long life.
The vehicle remains with the original master cylinder, wheels, hubs, transfer case and standard prop shaft. Fitting is simple and parts are readily available and economically priced.
An engineers report is provided for ADR certification and road registration.