The PDI brake booster is a significant upgrade (50%) to the 60 series, which had a single diaphragm unit. It will fit on auto models and manual with the standard clutch master cylinder, but not if you have the vacuum assist on the clutch master cylinder (due to interference).
If you have the vac assisted clutch booster, you can change it out for a non assisted clutch master, but this will require cutting and re-flaring of the hydraulic line for the clutch. Considering the improvements in clutch design, a new clutch will probably negate the need for vacuum assist and this will allow for the PDI brake booster to be installed.
Braking upgrades should be done in conjunction with power increases and we have found the biggest improvement can be achieved with this mod.
Our PDI dual diaphragm brake boosters have been ADR tested and proved to pass all tests. Our design allows us to exceed the standard brake specifications for those with:
increased weight (both GVM and GCM).
larger wheel diameter
Following installation and adjustment of the rear brake bias the braking distance at 80kph dropped from 26m to 16m. Very quickly we found we could do turning and stopping maneuvers that would have be both crazy and impossible before. This is great for a powered up cruiser and potentially life saving if you have increased your weights, fitted larger tyres or are towing. Many will say “the brakes are fine” but when asked if the pedal goes hard, before full braking can be achieved, they remember how scary that can be.
With a PDI brake booster less than 50kg push would be required for full braking - this is a significant improvement that will be noticed.
We recommend these be installed with braided brake lines as line pressure will be increased and the standard lines may be compromised if still original. This is both due to age and the potential for damage as they are fitted to a 4WD. Installing braided lines will also give a better result as factory flexible lines bulge and reduce effective application of the pedal.
Note: If you have air in your system, which can be very very difficult to bleed out, the larger booster will make this more apparent, due to extra force that can be applied.
These boosters are impressive, and we are sure every cruiser owner would install after driving a cruiser fitted with one of these boosters.
We recommend these be installed with braided brake lines as line pressure will be increased and the standard lines may be compromised if still original. This is both due to age and the potential for damage as they are fitted to a 4WD. Installing braided lines will also give a better result as factory flexible lines bulge and reduce effective application of the pedal.
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The only fitting issue is for those with rear air con or ice box console where the alloy pressure lines are routed close to the brake booster and will result in interference such that our larger boosters can’t be fitted.
Please do your research before purchasing and attempting an install. For those fitting to petrol models we suggest and additional vacuum reservoir be added to ensure the booster is able to provide full assist for a period after the engine is turned off or if being driven enthusiastically where vacuum build up is limited.
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