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I'm a bit stuck trying to work out the difference in design/how each works, of these brake limiters in the 205 1.6 & 1.9GTi and the 3091.6SRi &other 1.6 injection models?GRi? and 3091.9 GTI - maybe others not sure so photo 1 - from previous advice and reading the Haynes I think it works using a ball bearing inside. It seems this in installed horizontally in the 2051.6 gti models in the engine bay under the ignition coil. bigger in size than the second type below must be because it has a large ish ball bearing inside (?) this makes sense that it works on inertia because its mounted horizontally or close to H, it would appear the outlet is on the front so maybe the ball bearing moves forward when braking deceleration - that would make sense right(9?) that limits the fluid out under braking. photo 2 - are these just pressure limiters? they appear to have smaller size. not big enough for anything inside. there are different part numbers listed for the 1.6 309injection modelXU5 and the 309 1.9. gti?XU9 I think that the 309 gti 1.9 had two brake lines for the rear with one of these limiters in each line. Each line is served by one port from the Master cylinder at the front/1st circuit? I need to check that though I am not 100% the 1.6 SRi 309 has both brakes served by one port from the master cylinder/ nearest the driver on the left I pictured the old one from the 1.6 sri and the new one I got which I think is the correct part no Ill need to double check this now as it could be the 1.9gti version - they look the same so I ll need to check I have seen like "smaller versions" of these on the 1.9 205 gti installed at the rear in the lines. well look similar it's a hexagon shape in cross section that looks the same I guess. the length is much smaller. could cut old one in half I guess to make sure - pretty expensive though even hard to get them new again! I need to work out what part numbers are, peugeot part numbers and bosch part number for my 1.6 injection single one in line to rear - as previous advice and discussion it is in the engine bay seems to be vertically mounted. therefore these type 2 ones cannot be inertia devices ? they must just be pressure limiters / proportionate reduction devices? Ill figure it out eventually I guess LoL