Thread: Brakes on 3.0 vs 2.7

Originally Posted by PerthDisco

Why, why why does LR have to be teacher's pet then.

Likewise on that basis when fitting Compomotive 18"s it is defeating the manufacturers design no more/less than changing back to the 2.7D discs and calipers? What is the exact law that is being broken?

Agree - not a D3/D4 thing.

Moral of the story - don't get anywhere near a LC200 with a tow as it is a wonder with their inferior braking system they can stop at all let alone swerve to miss you.

Not really,if you use the 18" size as per placard,very little changes,and is legal.

Changing brake rotors to a smaller size, and calipers, is a massive change which may mean the vehicle has to be plated by a suitably qualified vehicle modifier,or it may be illegal.

Yes no logical reason to reduce brake size. the 2.7 brakes are just ok if using in a 'normal' duty cycle. It is certainly a welcome upgrade in the 3.0 models. I stuck the 4.2SC 360mm brembo fronts on my td6 as i tow a decent size van and car trailers etc from time to time. Can never have too big brakes 😎. Saying that i can still fit 19" rims, which so far haven't been any problem.

Jc

Originally Posted by PerthDisco

The best argument I have seen is that the D4 calipers have a rib cast into them that block the fitting of an 18" wheel (other than Compomotive) to pass the Moose swerving test on low profile rubber. Don't know why does not apply also to LC200.

The early alloy 3.0 rear calipers had blobs of metal protruding out the ends for no apparent reason other than to block the fitment of 18" rims but were later replaced with the D3's smaller, strictly functional cast iron calipers that allow 18" rims to fit (same as the V8 D3), presumably because the alloy calipers caused squealing in reverse when dusty.

The 2 centre ribs on the front calipers protrude further out than the end 2 ribs. If a person is prepared to make the modification, the centre hump of these 2 ribs can be reduced a couple of mm to allow 18" rims to fit. IMO this is a better proposition these days than fitting 2.7 brakes to allow 17" rims due to the range of 18" tyres now available and that LR 18" rims now fit the rear.

Originally Posted by Graeme

The early alloy 3.0 rear calipers had blobs of metal protruding out the ends for no apparent reason other than to block the fitment of 18" rims but were later replaced with the D3's smaller, strictly functional cast iron calipers that allow 18" rims to fit (same as the V8 D3), presumably because the alloy calipers caused squealing in reverse when dusty.

The 2 centre ribs on the front calipers protrude further out than the end 2 ribs. If a person is prepared to make the modification, the centre hump of these 2 ribs can be reduced a couple of mm to allow 18" rims to fit. IMO this is a better proposition these days than fitting 2.7 brakes to allow 17" rims due to the range of 18" tyres now available and that LR 18" rims now fit the rear.

When I measured it up I calculated that I had to remove about 10mm from the ribs on the front calipers to fit the OEM 18" wheels I have. The estimated shave is shaded RED in the attachment. My engineer would not sign off on this modification.

Chris

The end ribs are untouched and only 3-4mm off the highest points of the centre 2 ribs is all that is required.

If I can't find sufficiently durable, quieter tyres for my L322's 20" rims then I'll fit the front discs and slightly shaved calipers from the more powerful, faster accelerating, same GVM and towing capacity 5.0 L322 of the same year which uses the same caliper as the 3.0 D4, noting that the D3/D4 LR 18" rim already fits the rear.

Originally Posted by Graeme

The end ribs are untouched and only 3-4mm off the highest points of the centre 2 ribs is all that is required.

The end ribs actually do need about 1mm taken off, the centre two need about 2 -3 mm taken off, and the trailing edge of the front of the main body (leading up to the ribs) needs about 0.5mm taken off to provide enough clearance for a standard LR 18" wheel to turn without fouling.

So the question remains if those ribs are there solely to exclude 18" wheels from fitting? The amount of metal to be removed would not seem critical.