The 141s were awful pre-refurb and only marginally better post refurb.
I remember the suspension being completely coil bound as the train entered the platform and as the train stopped it would rock back and forward for ages as the spring plank had 2 coil springs on it (1 in front of the axle-box and 1 behind) but only 1 damper mounted in the centre of the axle-box so there was no damping to the individual springs.
On refurbishment they were fitted with 2 dampers so each spring was controlled to prevent the movement.
They were also fitted with brake cylinders on the chassis with Bowden cables (think very thick bicycle brake cables) connecting the cylinders and tread brakes, a little bit of wear (or too much heat) and the brakes were useless, hence the expensive conversion to direct acting brakes.
The bodies were also 8ft6in wide (the same as Leyland National buses) which meant that they could only accommodate 2+2 seating as opposed to 3+2 lowering their carrying capacity quite a lot.
The well known engine and gearbox issues, so yep very good units NOT, um I think that will do for now, my fingers are hurting!