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If the brake light and the abs light are coming on at the same time then the master cylinder is low on brake fluid.
Does it shake when coming to a stop?
That does not sound brake related, that sounds like you have a misfire in the engine. Possibly you have some bad spark plugs and spark plug wires.
I would first check the brakes master cylinder for being low on brake fluid to repair the light. If you engine is shaking on acceleration and coasting that is a engine misfire.
The shaking is coming from the rear of the van?
You have two separate concerns. One is the light. The light is coming on because the master cylinder is low on fluid. The second concern is the vibration from the rear. This is usually caused by a drive shaft imbalance, bad u- joint. Could be a bad tire in the rear.
If it started right after they put the shoes on then they probably messed something up replacing the shoes and the wheel cylinders.
I would have there work double checked by someone.
You open the hood of the van and on the drivers side in the back corner is a master cylinder. It is a clear bottle with marks on it for full and low see if it is full.
Does not matter, Ill send you a pics so you know what to look for.
The antilock brakes do not activate unless you step on them. If it is activating or vibrating when you are stepping on the brakes and it only started acting up after the rear brakes were done, it is possible the rear brakes are the concern.
Let me know i you have any other questions thanks.
do you have any other questions on your concern?