New shiny brakes

7 min read

Project Lexus IS 250

PART THREE: Martyn Knowles fits new brake discs and pads to the front and rear of our IS250.

Although brakes are crucial to the safety of a vehicle, the way they perform on modern vehicles is pretty much the same on all makes/models (in general). The most notable difference being how the handbrake works. Here, our handbrake operates via your left foot which moves shoes sat inside the rear brake discs.

A MOT advisory in May 2023 said that our IS rear brake pads are wearing thin. I could see the outer pad was low by shining a torch into the wheel, but at the service (last issue), I took the road wheel off to get a better view. Yes, they need changing asap. The front discs had worn down so it was best to renew the lot.

According to service invoices, the main dealer put two remanufactured calipers on the rear, along with new discs/pads at 52,622 miles (about 35,000 miles ago). Front disc/pad change was carried out in 2018 (almost 30,000 miles ago). In 2022 (around 10,000 miles ago), the main dealer removed a seized front slider pin and renewed. Not sure which side or why, as the pads had worn evenly.

As you will read in the rear disc and pad change, I made an error on dismantling, which meant a new pad fitting kit was required. A thumbs up to a company I found selling such a kit on eBay after a Google search. I haven't used Brake Developments before, but they charged a reasonable £30 for a full rear pad fitting kit (inc postage). The best thing, though, I ordered at 11am one day and the kit arrived midday the next.

Great service and the gold-coloured pins do look smart once fitted.

IN ASSOCIATION WITH

FRONT DISCS & PADS

1 partsfinder.bilsteingroup.com indicates that the mimimum disc thickness of a ventilated front disc is 26mm. We can see these are within tolerance, but there is a lip to the edge of each disc. We have quality new discs from Blue Print, so I get to work.
2 I started on the offside. Undo the two 14mm caliper-to-carrier slider pin bolts. Now pull the caliper away from the disc. Hang the caliper up on the suspension strut with a dedicated wire or bungee cords so as not to stretch the brake hose.
3 The slider pins stay within their rubber sleeves. Pull them back and forth to see if they are free in movement. You can completely pull them from the rubber (as shown) to check if they have enough grease or are indeed starting to rust. Here they are just fine, with a thin layer of brake grease that doesn't look old or solidified. If in doubt, you can always wipe the old grease away, clean up the pin with a wire brush and add a smear of brake lube.
4 The old pads remained in situ, so I used a small flat-bladed screwdriver to lever them out. Circled are the two 17mm bolts that hold the caliper carrier onto the hub. Undo and remove these to release the carrier

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