Come on the Google experts - RD400F Caliper diagram

[Gingernutz]

I'm a bit stuck with the XS400 - it turns out it has an unusual front caliper normally found on an RD400F Daytona - I have two manuals and neither tells you how to take it apart because they describe another type. I've googled until I'm frsutrated but can't find a manual
This is the one on my bike


Looking at this view the flat head screw in the haynes manual is nowhere to be seen


Any ideas?

[BIG MAC]

Looks very similar to the rd250e caliper if memory serves...equally you sure it isnt the same as the xs250 one?

[mickdel]

There's an article on restoring air cooled RD's in Practical Sportsbikes this month.  You'd probably get a good price for that caliper.    If you email the mag,  I'm sure they'll be able to help you.

[John Silva]

I'm a bit stuck with the XS400 - it turns out it has an unusual front caliper normally found on an RD400F Daytona - I have two manuals and neither tells you how to take it apart because they describe another type. I've googled until I'm frustrated but can't find a manual
Any ideas?

It looks like a 1980 XS400SG / 1979 RD400F caliper alright.
A good source to check parts is www.cmsnl.com

Front caliper for the 1980 XS400SG is here http://www.cmsnl.com/yamaha-xs400sg-1980.../E-05.html

You should be able to see all the bolts that hold the caliper together now and be be able to dismantle. 

[Gingernutz]

Thanks John, stupidly once I had the diagram I went ahead and started stripping it. Stupidly because the seal kit I got was designed for the wrong caliper - weird though isn't it - hour and a half in the garage and got nothing done except covering my legs in 15 year old dot 3 and I'm happy as a pig in sh*t

[John Silva]

Now you know the right year and model it should be easy to get the right seal kit.

All the best with the rebuild. 

[Gingernutz]

Rebuild complete whilst drunk and only one piece left over - wonder where that washer was meant to go. Will bleed them in the morning - fully expect brake fluid all over the shop :b

[Gingernutz]

Coming along nicely - at least cosmetically