Braking a motor with power transistors

Question

I am running 2 DC motors with 3 SN754410's: each motor gets one half of each bridge. Everywhere I look I see that pulling both logic inputs low with the enable high should brake the motor by shorting its leads together. However, when I measure the resistance between the two motor power leads (motor disconnected) with the enable high and both logic inputs low, I get a resistance of 60 Ohms. The H-bridges are otherwise functional

Accordingly, I am attempting to implement an alternative brake. I have some of these (http://www.vishay.com/docs/91217/91217.pdf) 30A power transistors lying around. Could I use them to brake my motor by putting one from each motor lead to GND (see below for setup when I want to brake) and turning them on when I want to brake?

^{simulate this circuit – Schematic created using CircuitLab}

I am not using a relay as they are too slow for my code: I get shorts through the bridges when the bridges turn on but my relays have not finished switching.

Answer 1

Figure 5 of the datasheet shows the standard half H-bridge configuration with protection diodes.

^{simulate this circuit – Schematic created using CircuitLab}

Figure 1. Motor circuit.

^{simulate this circuit}

I would expect that you should be able to give maximum braking by holding closed one of the already closed switches and let the freewheel diodes look after the rest. This will initially maintain the current and rapidly cause dynamic braking.