MEI Air Disc Brake Calipers are identified by the part number which is marked on the ID plate. After a long life in service or while still on the vehicle it can be difficult to read the information on the ID plate. Therefore the following can be useful in assisting identification.
1. Check the air chamber mounting angle. This ranges from -12o to +8o.
For radial calipers (LNR225) the mounting angle ranges from +86o to +93o.
2. Check if the Long Guide Sleeve is on the Left or Right as shown.
3. Confirm the brake size. If there are bolts visible as shown in picture 1 (see below), attaching the cover plate to the housing, the brake is either LB195, LC225 or LA225.
• Measure the caliper at its widest point. If the caliper is 350mm diameter it is an LB195 brake.
• If the caliper is 375mm diameter it is either an LC225 or an LA225 brake. You can either:
• Measure the diameter of the steel tappet head as shown in picture 2 (below). If the tappet head is 65mm wide it is an LC225. If it is 58mm wide it is an LA225.
• Measure the distance between the guide sleeves as shown in picture 3 below. If the distance is 278mm it is an LA225. If it is 266mm it is an LC225.
|Visible Bolts||Tappet Head||Guide Sleeve Distance|
Tip: To distinguish between the LC225 and the LA225, or the LB225 and LV225, examine the steel tappet heads. Notice how the tappet heads are more prominent on the LC225 / LB225 (left) than on the LA225 / LV225 (right).
There are two other measurements that can help to identify the caliper.
The rotor diameter will be 377mm for LB195 brakes. For all other brakes it will be 430mm.
The pad width is 248mm for LNR225 and LB225 brakes. It is 245mm for LV225 brakes, 208mm for LA225 brakes and 211mm for LC225 and LB195 brakes.
4. Fitment Type - check the pad wear sensor cable fitment type on the chain cover - it can be without sensor (left) or with sensor (right).
The pad wear sensor types are shown below:
|On/Off (old version)||On/Off (new version)||Linear||Stepped|
If you have determined the size of the caliper, the position of the long guide sleeve, the mounting angle and the fitment type then you should be able to identify the MEI part number.